This is in fcat not snapcraft blocking your hypervisor, but the multipass VM … you can make snapcraft use lxd containers instead of multipass …
$ sudo snap install lxd
$ sudo lxd init --auto
now you should be able to use snapcraft with the --use-lxd option (you might need to log out and back in again to be in the newly added lxd group so you do not need sudo for unprivileged containers) so your builds run in an lxd container and do not touch the hypervisor at all …