IMO, there are reasons for the WSM action differences that are beyond typical gun builder/hacker knowledge.
Yes, you could build it however you like. But why not atleast as good as the factory?
The CRPF bolt head would include a slot for a standing ejector blade, which a WSM action would have. Changing to WSM head on a non-WSM action would leave you with no ejector. The firing pin would have to be changed also, as WSM boltheads use smaller firing pins(to strengthen the head).
I don't know what Remington does(don't care), but magnum actions should provide for a larger tenon, so that you can run the cartridge to the same or in this case higher potential as other cartridges(SAAMI max for a WSM is 65Kpsi) without extraction issues. If you don't get enough barrel steel around the chamber of magnum diameter cartridge, an interference fit can be left on firing before reaching SAAMI max. This can lead you to sizing more than needed with a better design(factory design).
You know Winchester put some real efforts into feed, extraction, and ejection to make WSM/WSSMs work. Savage recognized it, and so should you.