The FR engines are, I believe, extremely good. Robust, easy starting, long-lived. Pretty much the height of Lister's diesel skills, and they made stacks of them, so spares shouldn't be a problem.
Re transforming 110v - it's a doddle; you just need a 2:1 transformer capable of handling the load. 122amps @ 115v = a fairly beefy 14kVA, so you could look for a 15kVA autotransformer.... or, if your loads aren't so big, why not use a bunch of site transformers wired "backwards", i.e. feed it 110v, it should give 220v ish at the other end.... Note, I've never done this, but a bit of googling suggests it shouldn't be too hard. Just watch the ratings, it'd be easy to overload it and cook/set fire to/explode the transformer...