I appreciate the cleverness, but no: trying to solve too many problems at once ends up with no problem being solved at all.
Want to get rid of the fishing fleet? Make a credible offer of residency and amnesty to all their crews - no strings attached, no continued use as pawns in politics. Simple trade: they bring in and surrender their vessel, you give each a green card, a key to a room, some starting cash, and a "thank you for your service", and forget about them.