While you could do this, the bigger question is will your utility approve your interconnection.
If it was small scale, and you’re on a true three phase system, not a high leg delta, then I’d rather see you use micro’s and phase balance them.
If it’s high leg, then you’d want to backfeed just the single phase pot — and again: you’d need to check with your utility first on interconnection requirements, and transformer sizing. Most of the time a high leg setup is for a well, and the tx size can be small (like 10kva) don’t get caught without having checked this first.
If it’s 208Y/120V, there are small size inverters available for that voltage: Enphase, SolarEdge, etc.