First I want to say thanks to everybody for all the genuinely useful replies.This TidBit community is just perfect for things like this. A lot more responsive and helpful than the Apple Support community or related Reddit groups. I’m glad it exists.
Second I want to say (hitting myself on the head) - Duh! I completely forgot about the ability to have a USB-C to Lightning adapter for my existing default Apple earbuds! I don’t know what I was thinking. I thought I had to go completely wireless. That might be the easiest solution, since that’s what I do for Zoom on my MBP, but I also want something for long dog walks. I guess the default earbuds will work for that as well.
I actually have a wireless headset already that somebody gave me. A brand called SoundPeats. Is that a well known brand? Apparently it’s pretty inexpensive, like $30. I had been using it on trains going back and forth to my volunteer teaching class on Sundays. And on long international flights. But our classes have all been on Zoom since the pandemic, so I haven’t had a chance to use them. I guess I’m not much of an audiophile, because they sounded good to me. But the one time I tried to use them with a phone call it didn’t seem to work well. I think there is a time lag with wireless headsets. Is that true?
I do like having my ears completely covered rather than sticking something in them if it’s a long period of time. On the other hand, I also want something that is (1) light, (2) very portable, (3) if it’s a headset, it would be nice if collapsed flat, and (4) also worked for a really long time on one charge. I think the latter one is a show-stopper with most ear buds, including the Apple Pro ones, right? I mean, they aren’t going to last a 14 hour Tokyo-to-Boston flight, are they?
I’m looking over all the comments now. Thanks again!