Truly it depends how he would of handled it.
He could of easily had a point in their two separate paths that merged the 2 in a similar pathing later (variations of the same scene type beat)
Would've taken time but not that much more (thats just the scenes themselves not fights, that could add to it)
Although personally the time thing doesn't bother me considering how long he pumps into making em already (his work hours are insane).
While that scenario could be interesting, there's no way that WW could merge the one we got now and a Klaus one, the differences would be way too much for both to reconcile at any point due to a lot of reasons, but mainly:
1. Joining Klaus would make Alice and Michael hostile to us, and we would probably have to kill them in the climax of the arc (Damn that would be an awesome fight lol).
2. Charlie would be a lot more trusting towards us if we were working with Oscar, and that would throw a major wrench on Ella\SIN's.
3. We probably would have been recruited way earlier into HERO due to Klaus' dealings with Xanthe, and worked more closely with Tifanny too.
Just one of these alone would already make it a nightmare to integrate both paths into one, and this is just from the top of my head, I imagine that a lot more problems would start to crop up under more scrutiny, so yeah I have to agree that it was for the best that WW scrapped the idea.