Making Intellisense see resources generated by custom MSBuild target (WPF) - wpf

Question

In my net4.8 WPF project I have an Art folder which contains .svg files.
I have created an MSBuild target which:
Invokes inkscape to convert .svg files to .xaml, placing the generated files in the project's intermediate output directory.
Includes the generated .xaml files into the target binary as resources.
Then, in the XAML of my application, I have <Frame> elements that reference the .xaml resources to display the images.
So far, so good; all this works.
The problem is that when I do this, intellisense knows nothing of my generated resource files. I would like intellisense to know those files, and give me suggestions, because the application is bound to have lots of them, so using blind binding-by-name is soon going to be problematic.
Steps to reproduce the problem:
STEP 1: make sure you have a relatively recent version of inkscape installed and accessible via your path.
STEP 2: Create a new C# Windows Desktop "WPF App (.NET Framework)" application project (+solution) targeting .Net Framework 4.8.
STEP 3: Add a XamlFromSvg.targets file with the following content:
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<!-- Ensure Visual Studio puts the XamlFromSvg item in the Build Action dropdown -->
<ItemGroup>
<AvailableItemName Include="XamlFromSvg"/>
</ItemGroup>
<!-- Instruct MsBuild to include our "Compile" and "Resource" targets in the Build -->
<PropertyGroup>
<BuildDependsOn>
XamlFromSvgCompile;
XamlFromSvgResource;
$(BuildDependsOn);
</BuildDependsOn>
</PropertyGroup>
<!-- Convert ("compile") .svg to .svg.xaml -->
<Target Name="XamlFromSvgCompile" Condition="#(XamlFromSvg)!=''" BeforeTargets="BeforeBuild;BeforeRebuild"
Inputs="#(XamlFromSvg)"
Outputs="$(IntermediateOutputPath)X\%(XamlFromSvg.Identity).xaml">
<Message Importance="High" Text="XamlFromSvgCompile: %(XamlFromSvg.Identity) -> $(IntermediateOutputPath)X\%(XamlFromSvg.Identity).xaml"/>
<MakeDir Directories="$(IntermediateOutputPath)X\%(XamlFromSvg.RelativeDir)" Condition="!Exists('$(IntermediateOutputPath)X\%(XamlFromSvg.RelativeDir)')"/>
<Exec Command="cmd /c inkscape "%(XamlFromSvg.Identity)" --export-filename="$(IntermediateOutputPath)X\%(XamlFromSvg.Identity).xaml""
Outputs="$(IntermediateOutputPath)X\%(XamlFromSvg.Identity).xaml">
</Exec>
</Target>
<!-- Add .svg.xaml as resource -->
<Target Name="XamlFromSvgResource" Condition="#(XamlFromSvg)!=''">
<ItemGroup>
<GeneratedXamlFromSvg Include="$(IntermediateOutputPath)X\%(XamlFromSvg.Identity).xaml"/>
</ItemGroup>
<Message Importance="High" Text="XamlFromSvgResource: $(IntermediateOutputPath)X\#(XamlFromSvg.Identity).xaml -> %(GeneratedXamlFromSvg.Identity)"/>
<CreateItem Include="%(GeneratedXamlFromSvg.Identity)">
<Output TaskParameter="Include" ItemName="Resource"/>
</CreateItem>
</Target>
<!--This is here just to prevent "unknown item group" warnings. -->
<ItemGroup>
<XamlFromSvg Include="foo" Condition="False"/>
</ItemGroup>
</Project>
STEP 4: Near the end of WpfApp1.csproj, after the <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" /> line, add the following line:
<Import Project="XamlFromSvg.targets" />
STEP 5: Add an /Art folder with an .svg file (Say, Misc.HamburgerMenu.svg.) You can use the following sample .svg file:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" id="svg8" width="500" height="500" viewBox="0 0 500 500">
<g id="g6" transform="matrix(27.777778,0,0,27.777778,-83.333334,-81.333336)">
<path d="M 3,6 H 21 V 8 H 3 V 6 m 0,5 h 18 v 2 H 3 v -2 m 0,5 h 18 v 2 H 3 Z" id="path4" />
</g>
</svg>
STEP 6: From within Solution Explorer, right-click on the .svg file and select "Include in project".
STEP 7: Right-click on the .svg file again, select "Properties", and set the Build Action to XamlFromSvg.
STEP 8: In App.xaml insert the following:
<Frame x:Shared="false" x:Key="Icon.Misc.HamburgerMenu" Source="/X/Art/Misc.HamburgerMenu.svg.xaml" />
STEP 9: In MainWindow.xaml, replace <Grid></Grid> with the following:
<ContentControl Content="{StaticResource Icon.Misc.HamburgerMenu}" Margin="50"/>
STEP 10: Build and run; You should see a window displaying your .svg file.
STEP 11: Now go back to App.xaml. If you place the cursor on /X/ and hit Ctrl+Space.
Intellisense will suggest anything but /X/Art/Misc.HamburgerMenu.svg.xaml. Intellisense knows nothing of this resource.
And ideas how to solve this problem or achieve the same result by other means would be welcome.
(However, any ideas aiming to achieve the same result by other means must actually achieve the same result, which is to begin with .svg files and to have these files displayed in a net4.8 WPF application without the need to perform any manual steps whatsoever.)
Note: I know netcore supports .svg files, but I am sticking with net4.8 for now, which does not. And I have heard of 'XAML Islands', it seems like a clunky additional moving part held together by shoestrings, so I do not want to try it.
Also, any suggestions on how to improve XamlFromSvg.targets would be welcome. (I just compiled it from samples, I hardly know what I am doing.)