It's not a question of choosing to get involved. You have two choices: 1) don't disclose your medically necessary needs to the carrier and suffer the potential medical and other disruptive consequences of not disclosing (including being denied boarding at the gate) OR 2) disclose, be referred to carrier's medical and deal with them.

This isn't meant to be about convenience, but frankly, the carriers' medical staffs are experienced in the special risks associated with high altitude and limited movement (what if you are stuck on the tarmac for 2 hours and there is turbulence aloft so you can't get out of your seat?). If I were in OP's situation I would want to know what's medically recommended and, if a carrier expressed concern about transporting me on a given aircraft, I'd be concerned too.