Running a BOSS on single phase

I am eventually going to convert to a modern control but I would
like to get my BOSS 4 running as cheaply as possible. I have a
Static converter and was thinking I can run the three phase motor
on that. Most of the electronics uses 2 legs of the incoming
3 phase/208v. I was thinking about running the electronics from
a single phase source, maybe using a 20A variac I have to adjust
the correct voltage. Big problem, I think, is the stepper drives
get power from a 3 phase transformer. Is it possible to run this
transformer on single phase?

Any help appreciated.

Thanks,
Scott