Andy, yes as brigsy and os say you're better off welding the lot together. It seems they can slip otherwise
We did glenn Hi 5's this way recently - but it seems that it's the bottom pulley that slips on the hub, not the trigger wheel itself!
Re Adaptronic vs. Renix flywheel, no way around that one without altering the pattern. It's just a silly pattern. You could machine out the pair of 'filled' teeth so that each big tooth became 2 normal sized teeth, then you could probably write a config to to reset every 180° from the remaining missing teeth.