Computed column slows down query performance in SQL Server 2012 - sql-server

Question

In my select statement, the column DisplayStatus is a computed column that significantly slows down the performance.
I tried to make it PERSISTENT but it tells me that table need to be dropped and recreated again. I cannot do that, I am not the owner of those tables.
Scalar function (pretty complex) is responsible for computed column.
My select statement:
declare
#EffDateFrom datetime ='2017-02-01',
#EffDateTo datetime ='2017-08-28'
SET NOCOUNT ON
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
IF OBJECT_ID('tempdb..#Data') IS NOT NULL
DROP TABLE #Data
CREATE TABLE #Data
(
QuoteID int NOT NULL,
[EffectiveDate] [datetime] NULL,
[Submitted] [int] NULL,
[Quoted] [int] NULL,
[Bound] [int] NULL,
[Exonerated] [int] NULL,
[ProducerLocationId] [int] NULL,
[ProducerName] [varchar](300) NULL,
[BusinessType] [varchar](50) NULL,
[DisplayStatus] [varchar](50) NULL, --This is the problem
[Agent] [varchar] (50) NULL,
[ProducerContactGuid] uniqueidentifier NULL
)
INSERT INTO #Data
SELECT
tblQuotes.QuoteID,
tblQuotes.EffectiveDate,
CASE
WHEN lstQuoteStatus.QuoteStatusID >= 1
THEN 1
ELSE 0
END AS Submitted,
CASE
WHEN lstQuoteStatus.QuoteStatusID = 2 OR
lstQuoteStatus.QuoteStatusID = 3 OR
lstQuoteStatus.QuoteStatusID = 202
THEN 1
ELSE 0
END AS Quoted,
CASE WHEN lstQuoteStatus.Bound = 1 THEN 1 ELSE 0 END AS Bound,
CASE WHEN lstQuoteStatus.QuoteStatusID = 3 THEN 1 ELSE 0 END AS Exonareted,
tblQuotes.ProducerLocationID,
P.Name + ' / '+ P.City as [ProducerName],
CASE
WHEN tblQuotes.PolicyTypeID = 1 THEN 'New Business'
WHEN tblQuotes.PolicyTypeID = 3 THEN 'Rewrite'
END AS BusinessType,
tblQuotes.DisplayStatus, -------------This is the problem
tblProducerContacts.FName +' '+ tblProducerContacts.LName as Agent,
tblProducerContacts.ProducerContactGUID
FROM
tblQuotes
INNER JOIN
lstQuoteStatus ON tblQuotes.QuoteStatusID = lstQuoteStatus.QuoteStatusID
INNER JOIN
tblProducerLocations P ON P.ProducerLocationID = tblQuotes.ProducerLocationID
INNER JOIN
tblProducerContacts ON dbo.tblQuotes.ProducerContactGuid = tblProducerContacts.ProducerContactGUID
WHERE
tblQuotes.EffectiveDate >= #EffDateFrom
AND tblQuotes.EffectiveDate <= #EffDateTo
AND dbo.tblQuotes.LineGUID = '6E00868B-FFC3-4CA0-876F-CC258F1ED22D'--Surety
AND tblQuotes.OriginalQuoteGUID IS NULL
SELECT * FROM #Data
Is any other workaround to bring this column without slowing down the performance?
Execution Plan: