The Baofeng MP31 has audio prompts but it is only 2 watts. If you can find a similar 5 watt radio it might suit your needs. Radios like the MP31 that don't have a display are more likely to have the voice prompts you are looking for.
Keep in mind that the ultimate goal is to keep the lightening outside of the living space. And while you are doing that, don't introduce any ground loops.
Some antennas come with that adapter which is nice. The Nagoya UT72/UT72G are such antennas. It's actually an adapter cable. The cable is very flexible and reduces the strain on the SMA on the radio.
The only one I can download now is the "Reference" copy. Can't get the "Official" copy. Not sure what the difference is but yeah, when I download the reference copy it does not have the Line A/Line C restriction.
I brought this up in a ham meeting to a guy that is very anti-Baofeng. I said "you got to get one now!" He just stared at me in silence like I had two heads.
@Hoppyjr you may have helped me decide where to spend my Christmas money. I really would like to switch from a mag-mount to NMO. Also would like a NanoVNA. Decisions, decisions.