I would stay away from any single-phase to three-phase convertors unless the three-phase load is very small.
The single-phase branch will need to provide at least 3*(110% to 120%) of the required 3-phase current capacity, and it may even be higher, depending on efficiency and power factor of the convertor and load.
While 3-phase circuits are not common in residential areas, and depending on where you live, it may be an option since all three phases are used to load balance within the general area.
Everlast Power I-MIG 200
Everlast PowerUltra 205P
Everlast SM 200-N
Thermal Dynamics Cutmaster 42