I would run the numbers using the following two cases and see if you can live with case 1:
Case 1: Lepke's fuel burn at 10 kts as he indicates above.
Case 2: An efficient full displacement hull trawler like the Krogen 42, that will not go 10 kts. At a moderately high (1.2*sqrt(lwl)) cruising speed of 7.5 kts, the Krogen will burn about 2.5 gph. If not either stick with your sailboat or if you want a trawler look at the Krogen. FWIW there are relatively few full displacement trawlers available, but the Krogen is a great one and is close to your budget.
David
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