For the AliExpress set, are you all referring to that "Keebox Shenpo Vintage Gray Blue PBT DYE SUB" set?
JTK could almost certainly handle a tripleshot TA, with versatile kitting. The Griseann / Royal Alpha generally turned out very good.
But too many were created, and it took a while to unload them, so we likely won't see a GB on that scale anytime soon. For more limited tripleshot runs, there's Domikey. Their keycaps aren't quite as nice as JTK, more 'mid.' And kitting is more limited, more restrictive. But they can do limited runs.