Getting parts at a local hobby store aren't a nightmare if you live close to a hobbytown as helion is a hobbytown brand. My local hobby store has walls of parts for helions as it is a hobbytown.

I think something is off on your setup. I have a volition with a 3800kv motor and a dominus SCT with a 4600kv motor. Both have steel pinions and the stock plastic spurs and have been ran dozens of times without issue. You need to adjust your gear spacing.

I don't believe hellion makes any metal spur gears.