My avionics guy (unsolicited, it's just one of those things he does)
put a BNC male to female fitting in the com cable and routed it just
under the control yoke. All you have to do is reach up, disconnect
the antenna cable from the wire to the comm radio and plug in your
handheld.

The only thing would have been nice was if he had told me he did it.
I found it while under the panel for other reasons.