I've not tried it, but perhaps the bottom metal from a 722 would work, or could be adapted, in a BDL stock. It certainly would not work in an ADL. If you had only an ADL stock, an ADL trigger guard could be used. I cannot tell you how a 722 magazine box compares with an ADL or BDL box. The BDL is shorter than the ADL.
In addition to inletting the stock for the safety, the cutout for the bolt handle will likely have to be altered. The 722 goes straight down, the 700 is swept back.