I'm afraid I cant be of much help locating what you're looking for. I can suggest that altering what you have by bedding it and relocating the swivel studs to the rear some and possibly even shortening the fore end may help with flex and unwanted barrel contact especially if shooting from a bi pod. I have seen where some guys have added material (wood epoxy etc.) to the grip area to make it more vertical but have never done so myself.
though you;re looking for a rare bird I think lefty makes an aftermarket offering even little tougher to find. If you can find a right handed stock to fit the bill the fix is easy enough. I have converted a similar right handed stock to lefty by simply filling in the bolt cutout with epoxy ( be sure to maintain clearance for the bolt release) and cutting a new bolt cutout on the left side with a dremel and a file.
Good luck and I hope you find what you're looking for.
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