How to add single quotes to one of the columns in PowerShell?

I have the following lines in a file:

pc_cc_text$fx_review1  CONSTANT VARCHAR2(100) := 'For Company Review'; -- AD_PRT_AUTH_(MSP)pc_cc_text$fx_review2  CONSTANT VARCHAR2(100) := 'For Dept Review'; -- AD_PRT_AUTH_(ADX)

I need to format them as follows:

WHEN 'pc_cc_text$fx_review1' THEN 'For Company Review'WHEN 'pc_cc_text$fx_review2' THEN 'For Dept Review'

How to do this in PowerShell?

This is what I have tried so far:

(Get-Content FILE | where {$_ -match ':='} | where {$_ -notmatch '^--'} | ForEach-Object{("'" + $_ -split ";|--")[0,1] -join ''}) -replace 'CONSTANT[^ ]'  -replace 'VARCHAR2[^ ]' -replace ':=', 'THEN ' -replace '^', 'WHEN '

This prints:

WHEN 'pc_cc_text$fx_review1    THEN  'For Company Review'WHEN 'pc_cc_text$fx_review2    THEN  'For Dept Review'

It is almost correct but the second single tick on the second column needs to be added. How to do this?