I usually recommend a ten-year-old 40’ name brand fiberglass monohull. At that age they are about fully depreciated, but still in great shape for another 20 years. Depending on many factors, these boats go for 150-300K brand new, and half (or less) than that after ten years.
If you’re handy with tools and don’t mind puttin some sweat equity into a 15-20 year old fiberglass boat in semi rough shape, you can pick one up for 25-40K. This might take a few 100 days of work to get it into shape for crossing oceans in style.
If you just want an escape pod adn don’t care about the cosmetics, you can get a 20 year old 35’er for under 20k that is perfectly safe for crossing oceans.
That last one is what I was thinking of.
Then all I’d have to do is figure out how to run the darned thing.
Option 2 would appear to be the Guajira.