Nick has already integrated it in the Dukes (my "weapon of choice" ever since its inclusion), so he is certainly aware of the unit.
The KLN-90B is technically only certifiable for RNAV2 at most, and other than DME arcs, it also doesn't do any of the fancier leg types AFAIK.
There is an option to not filter out RNAV1 procedures, but otherwise the capabilities will not really be beyond the build in avionics I would think.
So while I always love to see the KLN90B in more planes I don't think it should be a high priority thing at least.