I believe you should look into that relationship a lot further.......Imo a marine gas engine with 2000 hrs at your 25 kn number would be closer to 200,000 miles wear factor when you consider that boat engines are highly loaded all the time.
I 100% agree with bud37. 2000 hours mean 200K or more on a vehicular engine. Boat engines work very hard, all the time. Also, usage hours have almost no bearing on an engine's actual condition except the blatant fact that higher hours might equate to higher wear on internal parts. It's the maintenance that matters most.
I would suggest again to find out what is serviced in the target area (Carribean) easily. Might be caterpillars or Isuzu diesel - vs more common Cummins here in the US.
I like the trawler concept but hate the traditional trawler look also. Nowadays though, lines between trawlers and yachts are easily crossed. For example, Mainships are in reality mostly trawlers, but they are shaped like nice yachts (google Mainship Mediterranean for example). Remember, once you get there, it will be parked for a long time so space and most importantly, the configuration of that space is CRITICAL. That's why I like Carvers as they have more usable space inside. Trawler-like yachts are designed for slow long-distance travel in comfort and best use of liveable space.
Imagine buying a 700 sq ft condo to spend a few years in. Now see the configuration of your future boat in that context. How would everyday life be accommodated in your new boat? Can you lug groceries overboard easily? get on and off easily? It may sound silly now but I would also check "cockpit" in my boat wishlist as while underway, you might want to fish or hang around your "boat porch" at the dock. My current boat was my first yacht and its an aft cabin with no cockpit. I really miss it - pretty much every time as I climb those darn stairs up to the boat from my swim platform balancing coolers, ice, and heavy groceries.
Door entrance to your saloon is also important. How do I know? try getting a recliner or table in or out of a carver 396's (my 40-footer) cabin sliding door. You have to disassemble the furniture. Replace a refrigerator - forget it, you have to disassemble door and frame parts.
Until you visit your target boats and spend some time in them. Ideally, find one in a marina near you for sale and just visit it even if you have no intention to buy it. Be honest with the broker and tell them you are considering this model and want to visit to see if it suits your needs.