Oh yeah,there might be a sollution to your problem.
Since I don't have a photo I'll have to explain it.
This will work on a wood or fiberglass stock.
1)cut stock behind receiver section of stock and flatten (straight cut) bottom of stock behind trigger gaurd area.
2)install a shotgun pistol grip.you must also drill a hole in back of stock and front of pistol grip for alighnment pin.top or bottom,I don't remember.
3)install metal collapsable(?) stock from M1 30 carbine.
I saw this done and it looked real good.I'm going to do this for 1 of my prebans when I get time.
One word of wisdom here.Check the parts involved with this project (carbine stock) to make sure brackets are heavy enough to stand up to the recoil.This is something I haven't checked myself.Hope this helps ya out.
I like the look of the sopmod myself but can't justify the cost either.To bad they won't sell just the stock.