Okay I have successfully done this mod using your suggested parts and it worked out great! I used a 2 RCA (f) to 1 RCA (m) converter to also add a wired AUX line in case a someone else wants to plug in without BT.
Very straight forward install. Only comment is to plug the red 12v wire into an ignition switch rather than constant power (as suggested in instructions).
Also, I was able to remove the PR71 transistor by desoldering and pulling without having to take out the tape deck and volume knobs. I’m glad I was able to avoid additional deconstruction.
Thanks for the help y’all!