Rick,
I am not the rules expert but here is the exact text from the CMPicon rule book under the heading of "As Issued 1903 Springfield)"

(5) The use of shims made of any material is prohibited. The presence of
fiberglass, epoxy, glue or any other filler is prohibited. Laminated stocks
and stocks made of synthetic materials are prohibited.

Technically, I would say that you would be out of luck by gluing. However, at a local level I would be surprised if anybody gave a hoot about fixing a crack. I think the spirit of the rule ( I think) is to prevent custom bedding resulting in better accuracy.

As for the cross bolts, they are almost always peened or upset at the nut to prevent backing out. I've only replaced one set and you need to plan on putting new ones in because the old ones will be ruined. I drilled out the head side (left) until the head came off, and then pushed them out L to R.