I am thinking of an example like "B movie". I could say bo-filmo, but would it also be possible to use an actual adjective? For example, to say that something else is so "B"?
I'm not sure if letter names count as roots (they were not listed as such in lists I have seen), and therefore whether the usual rules apply to them. Certainly it would create a few collisions like da, la. If not, could I at least create B-eca, "having the quality of B", A-inda, "worth an A", or something similar?