Won't be a deal that is attractive to many (most?), but am a firm beleiver in the maxim "don't ask don't get". And for deals you get to write any rules you like
..........whether another can be persudaded to sign up is a seperate matter
On the sailing into the sunset concerns, maybe something older that needs a 2 year
DIY refit? - possible to sail away on anything, just on some less likely. (condition & age would make a quick re-sale less likely). Would also be more
boat size for your buck and less attractive vessel for others, so owner maybe more willing to deal to keep the
price up.