I have pushed a new branch based on 202502 at my repo debian/xen-last here: https://github.com/byteit101/edk2-debian. Note that c2c08abb36224f5a6700f12e6a16c07ad33a3fa9 is the real change. I also added on top c7b34aae3d3d873af6d57ff1d952021331c3450e which is just a "build faster" commit for testing, and shouldn't be pulled by a Debian developer.
With that tree built and installed, I was able to get all my HVM machines working by specifying: bios='ovmf' bios_path_override="/usr/share/ovmf/XEN_OVMF.fd"
