Paul, I agree with you on multiple profiles for yourself being a bit of a hassle. I have access to a few different gliders with LX90X0 in them. I have my own profile that I use, but I find that I'll update the 9000 profile in the Discus and make a small change for a data box or changing a weather overlay opacity. Then I forget to port that over to my 9070 profile in the Duo and I am missing that configuration the next time I fly the Duo. One of those "Damn, I thought I fixed this..." moments. These are big time first world problems, but managing the UI aspect of multiple profiles is a bit of a nuisance, especially across aircraft. If it was just task rules for a single glider I'd just focus on getting comfortable with changing those rules.
Multiple profiles for multiple pilots is unavoidable since you want the W&B changes, the logger updates and things like LX Connect to be properly configured.