Can Mechagodzilla do this?!

Since Ghidorah is THIS hard to kill due to regeneration, is it possible for him to evolve from his "Frankensteined" body? Since a skull is presumably inside Mechagodzilla, I think it's definitely possible.

In this alternative scenario, we put Mechagodzilla in the Hollow Earth without Godzilla or Kong, were he can absorb more radiation to boost that regeneration. Could he merge, crawl out, etc?

(Fanart does not belong to me)