Yes, it is possible by installing the Wyoming Satellite software on the Mark II. All the pieces are there, it's just missing some easy-to-install firmware.
Source: I worked at Mycroft on the Mark II and am now the voice guy for Nabu Casa (Home Assistant).
I just checked out that project, thank you! But, I don't see any instructions at all for even getting started, even after searching the issues. Is there a good place to find information? When you say "missing some easy-to-install firmware" it sounds like there is a big piece missing, no?