I like to do this too, especially on unused a/c as “TBD” and then a fleet ID, so for my 787-8s I use TBD 788 and then I can easily put it into Ctrl-F to search for unused A/C
You can also filter fleet management by fleet type. Does this not work?
You could also apply the same/similar name for the same a/c type, like LH does for their mainline, so that fleet types have similar names.
Unfortunately I’m sure we can’t change them, and there’s a chance that because (except US airlines) its on a first come first serve allocation basis, I doubt martin can either. Not at least to the degree you’d like.