I know it's a wild ideas, but I could argue to find a "kind of partner".....
Not really a partner, but a caretaker that would share the boat with you, take care of it and use it himself. It would be a joint venture, and he'd have a little skin in the game but might not want to afford a full time Fleming.
I've done that with aircraft, but not boats, and it's worked out excellent. Had a plane that I didn't want to "sit" while I was on extended boating. Found a guy who also wanted to use it and had the ability to maintain it. I got him qualified to fly it, made him a heck of a deal to use it and it worked great. When I came back, it was ready for me without any issues, and in a known condition. He would do the minor maintenance and cleaning but we hired out major stuff. Also, my friend would reposition it for me which also worked out great. The best benefit with this is keeping it running and used, and keeping the maintenance up.
Now, finding that guy might be a challenge, but bet there are plenty qualified right here on this forum. Heck, if my boating needs were a bit different, I'd consider an arrangement like that. A 50+ ft boat is just too big for my part of the world.
I enjoy doing some of the upkeep and maintenance work, but hire out the hard stuff.... but I keep track of it. Works for me.
This seems like the ideal situation...IF a trustworthy caretaker could be found. That person would also need experience on boats of the same size or close. This could be a very difficult setup to find.
It seems that some folks have been able to make boat partnerships work and it has turned out to be a good thing and allowed both people to have and use a boat they otherwise wouldn’t be able to, or like in my case, relieve the burden of a portion of the ownership in the management and maintenance of the boat.
However, many others seem to strongly caution against it and have or know somebody that has horror stories about it. It seems to be like everything else - you get wildly varying opinions and experiences, and so you end up not knowing if it would be the right thing to do or not.
However, perhaps many of those horror stories come from equal 50/50 partnerships where either side gets stuck because both have an equal say and want different things. What you describe above sounds like more of an 80/20 or 70/30 type setup, where the owner provides the boat and the capital to fund any major boat work needed. The ‘caretaker’ provides ongoing routine maintenance work himself, is local to the boat and can check on it regularly, has access to it for use a certain amount of days while the owner doesn’t need it, oversees any work the yard may be doing, etc.
A lot more details to work out there, but I could see this being an attractive setup for both parties. The owner has final say in all time on the boat, where it goes, the work that gets done, etc. The caretaker looks after it and keeps it in shape, for the benefit of using it himself a certain amount of time. This also gets the boat out on the water and being used semi-regularly. The trick is finding someone trustworthy with enough experience on boats and boat systems, who enjoys working on those, and otherwise wouldn’t be able to get into something like a Fleming, but would really appreciate that kind of boat and having access to it.
I know there are holes to poke in this setup too, but to my mind, it seems to have a chance at success if the right person is found, primarily because 1 person is making the major decisions, instead of the 2 in a traditional boat partnership.