I've had the same issues buying things from companies in Straya.
It's a pain.
Personally I'd be finding a stock replacement Toyota clutch kit, or even just the cover that was the right diameter for the flywheel, then get the flywheel redrilled to suit that kit.
I suspect something for a HiAce or similar would fit the bill.
Failing that, could you get the cover set up dead center, drill and tap the incorrect dowel holes so you have a 6 bolt cover and have 3 new dowel holes drilled.