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Can they guarantee no JIT code via static analysis as well? Or could someone sneak in a tiny bit of disguised JIT code just to get to this register?

I would assume a huge JITed VM implementation would show up easily in analysis.

They don't provide anyway to mark memory as executable.

Well, they do, because they have to run your code :P You just can't make a new page of code and mark it executable.

The OS only makes pages executable if they come from a signed app. There is no way for the app itself to do that.

If it makes it more clear, my comment was mostly "if your code page has a valid signature you can mark it as executable".