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Shamir: yes
KVM/QEMU: Well, I mean, neither KVM nor QEMU is a cryptocurrency wallet so there’s not a lot you could do with a Trezor.
If you mean like, running a Linux container in qemu, installing Suite on it and using the Trezor like that, then that really depends on whether your system can forward USB devices into the container, there is nothing Trezor specific in there.
keyring: not on the Trezor itself. You can buy a silicone bumper but from the pictures I’ve seen there is no hole for a keyring either.