Nope, no chance.
You can't get there from here.
The only way to do it involves some wild back-flips with a 5 KVA 120/240V transformer, but those are $400+. (you can occasionally get a find on Craigslist, but even then, the price will be greater than the price diff between this one and the generator you need.)
So back it goes.... if the well is a priority.
I assume you are in the USA for this answer.
120 volt circuits are not considered “low voltage”. Low voltage means 60 volts (I believe) or lower. 120 volts and 240 volts are the same voltage class and it is perfectly fine to run both of them in the same conduit.
Besides, in the USA, 240 volt circuits are simply two legs of 120 volts in opposite phase. While ...