If you're willing to take pictures, I'd be interested in seeing them. I'd suspect you might be hammered a bit though for an atypical sounding method. If the stock is a lost cause, hey, see what happens.
If there's too much slop in the current inletting and things are binding from being able to over tighten, maybe make your insert a little oversized. Then you can inlet and or glass bed to bear against solid stock material that won't allow the parts to flex into binding. Maybe you could mock it up first to figure out an appearance balance between proud metalwork and binding.
Sorry if I'm not understand what you're trying to figure out. Seems like without bedding anyway, your freefloating trigger guard could be subject to stress and now more sensitive to stock movement.
