I added a CRJ-550 Load Planner to my flightUtils application. If anyone would like to use it, please let me know ( Shawn at hanafarm dot biz). It requires WatchOS 8 and Apple Watch 3 or later.
I usually work on it when I’m on a long overnight. If there is any interest, I can write an iPhone and iPad version of the Flight Utilities, perhaps add iCloud support to keep the data synced between devices, and add other E-6B functions as desired.