Ceramics possible, Roller Bearings maybe
Ceramics can be run in high speed application, like rc helis and Real Motorcycles, now the roller bearing yeah that may work, but that is a lot of work involved. I understand the physics of the problem. But just swapping bearings or to a different type, does not mean the uneven load will go away, and as such you are now stressing the axle. So either way, yeah one can run better bearings, but you just moved the problem to the next component.
But we are getting off topic here, so lets just focus on the adapters not extensions.
Bigger the Better: Are anymore FG to HPI Adapters available for purchase?