Have you called H-S Precision? Looks like they have two different adjustable LOP set-ups on their Tactical series stocks. If the stock construction isn't totally different, maybe they can make a suggestion or sell you the hardware to convert your stock...?
https://www.hsprecision.com/shop2/stocks/pst.html
If nothing else, while not as aesthetically pleasing, I had one of those slip-on buttpads for my shotgun. It had a thick recoil pad and added half to three quarters of an inch to the LOP.
-Rick
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