well, lucky for you, you're a triathlete, which means you get to train all kinds of muscle groups.

in my experience, once i strengthened something, only infrequent tune-ups were required to keep the benefit.

honestly, i think you're getting ahead of yourself by worrying about cycling causing you problems. for now, just focus on the PT and follow that protocol to rememdy the problem & do not worry. in the meantime, find some kind of bike fitting solution and go from there.

FWIW, before tri, i had weak quads "caused" by running. i strengthened them and was able to run. also i had tight and short calves "caused" by running. so i continually work on that, and am able to run. my gait has changed with more flexibility; but nothing substantial. i used to worry that running would "cause" me to have these problems forever. but the PT remedied it.

in life most worry is mis-spent.