I’m not @coffeeat3 but still know a couple things, and have talked with OP before, so a couple things I can add/suggest/clear up. I’m generally in line with the CC mantra of love the school that loves you back, but I also know coxswains are built different, so it’s worth playing through.
First, stop cold-calling coaches. They’re in the most critical part of the season, and with respect, a call from a waitlisted student to see if they might be able to help for next year is literally their very bottom priority, and they would expect a coxswain to understand that. Fine to email but otherwise let it be.
Yes, you will see occasional coxswain transfers - which is to say I’ve seen at least one, from a lower-level D1 team to a better D1 team. I don’t know how much of a factor rowing played - e.g. I don’t know if they went through the NCAA portal. I’ve not seen a move from a club team, though, and that wouldn’t go through the portal. Also coxswain spots for transfers are really only a possibility if the team is down for some reason and doesn’t have a strong freshman class coming in. I would consider this a highly unlikely scenario at best.
PG for coxswains is not really a thing, AFAIK - the skills PG programs are building aren’t really coxswain-oriented.
I do know some coxswains who were disappointed with their college choices and took a gap year - got on a plane and coxed for Oxford Brookes or whatever - and had a story to tell when they re-applied (and your test scores can help then, which they can’t as a transfer). If you’re passionate enough about giving the coxswain recruiting process a chance again to pass on your college options - not a recommendation, just an analysis - this is by far your best shot. There will be some schools recruiting coxswains for their 2025 women’s rowing teams in Fall, though some of those spots are already full. I would not expect different results from men’s teams, frankly.
Finally, as I think I said in a different version to you some months ago, the only possible way a coach is going to even try to help you off the waitlist is if they’re 100% sure you’re going to attend. I know you want to hold out for Barnard and you’re trying to be upstanding through this whole process - and at this point it’s likely too late for any new message anyway, but I think you’ve ended up optimizing for the dream of one school over the dream of competing at a D1 level - which is fine if you knew you were doing that.
Finally finally, is club rowing right for you? One friend once described it as similar to rowing at a good-but-not-truly-elite HS program: you’ll have a couple athletes who could be competitive most anywhere, a handful who care a lot but who aren’t at the same level, and a handful who are just doing it for fun. If you don’t hate that about HS rowing, you might not hate it in college.