When you've got a large syringe, just push the fluid from the caliper to the open master cylinder reservoir.
Empty the reservoir a few times without removing the syringe, so you can push about 50cc through the system.
Works every time for me.
If you want to make a shaft drive that has no influence on the suspension, you need a complicated construction ( see paralever on BMW motorcycles)
I would prefer an enclosed belt drive...
I think that's the major problem with our sport. If you're not a trials rider you'll probably never heare of the sport. It doesn't get any TV coverage here in Belgium ( It used to when Eddy Lejeune was winning world titles) And there is very little or no promotion of the sport such as trial schools etc..
Changing the rules (stop or no stop) or the bikes won't make much difference i.m.o.
But the "light" trials chains have smaller outer dimensions so you can't combine a "light" 520 chain with a "normal" one.
Most chain manufacturers have the dimensions on their website...
I bought the bike second hand so I guess I'm not entitled to warranty, but I know of some guys in Belgium that bought their bike new and got a free replacement (AJP)