Fair enough. The limitation, as I say, will be the JST connector itself and the wiring you use to connect that socket with your battery. Especially for clusters, heavier gauge wiring is better, as I'm sure you know. If I were doing it I think I'd make a battery lead out of at least 16-gauge wire and splice it to one of those pre-made male JSTs with only a couple of inches of the supplied lead so as to keep the ~22-gauge wiring short. At the battery end I'd crimp on ring or spade terminals so that you can use the screws in the battery terminals for a solid connection. Then make a hole in the battery door (cut off a corner?) and a knot in the wiring between the splice and where it comes through the battery door to support/provide strain relief and to keep the little JST from getting disconnected just with the weight of the wiring.
I should have figured that motorcycle batteries were sealed these days.....it's been a long time since I've owned a motorcycle.
I guess we'll see if anyone actually has done this, eventually.