Ok, starting to see that maybe I'm looking for a solution that won't be easy
Saw this:
http://abttrac.com/sites/default/files/ABT-TRAC AC Thrusters.pdf
ABT-TRAC has DC systems, but only up to 12HP. Their AC systems can perform as needed for my project, but the catch is that they require an AC diesel generator for the primary power supply
I'm guessing that if ABT-TRAC did not consider it worthwhile to try generating the AC supply with a inverter, possibly due to the power losses involved, then continuing to look for such a thing may just lead me to someone who doesn't know what they are doing?
The amp draw from a 24 volt battery bank to provide 10, 20 or even 40 horsepower can't be less than what a similarly-powerful AC system's inverter would be. Except that some losses in the proposed inverter will add amperage
I'm guessing a BLDC system won't be much different
I'm going to finalize this pursuit, by recommending either a very low-power 24 volt motor (less than 10HP), or make use of the genset for direct AC power