Nicolai's USP is custom. If you don't ask, you don't get as I found out. They didn't do a 150mm travel Ion 16-29er....until now
Making an Ion 650b see earlier comment, 140mm may not be a huge leap, however, making an Ion14 a trail bike is also not a huge leap in terms of geo.
I think the Helius platform will survive, it offers a different ride and suspension performance to the Ion, very suited to trail riding. As such a Helius AC650b is already capable of being set at 140mm at the rear If I recollect correctly and customising/optimising the geo around a 140mm fork (if that was the idea) is straightforward.