HSM modules already have PKCS#11 drivers, because it's a standard, and that means they work readily with existing software and cover the requisite industry use-cases.
You're proposing taking web servers in a different direction simply because you find the general, widely supported solution to be antithetical to your tastes?
Unless you're actually going to write code here, I don't really understand why you care, or why you're advocating ignoring hard-won wisdom and experience that's encoded in a decent spec, just because you don't think you'll like it.
