I'm not aware of any such product on the market. 1/180 is, after all, a pretty freakish scale; I'm not sure any other kit is on it. (That grand old Airfix Victory dates from the days when manufacturers - particularly sailing ship manufacturers - designed their kits to fit in standard-sized boxes, rather than popular scales.)
About the best I can suggest is to take a look at what the model railroad companies have to offer in the way of N-scale figures. N scale is 1/160, which is pretty close. There are a couple of drawbacks to that approach. Figures designed for model railroads obviously aren't going to be costumed like eighteenth- or nineteenth-century seamen - and that's a mighty small scale for modifications. (On the other hand, it's so small that a convincing paint job could work wonders.) And virtually all of the N-scale figures I've bumped into have been sold in small packages of four to eight figures, pre-painted. The paint jobs aren't great, and the prices are such that a reasonable crew for a ship model would be mighty expensive.
One other idea. Lindberg sells two "pirate ship" kits under the names "Jolly Roger" and "Captain Kidd." They are in fact reissues of the French frigate La Flore and the German "convoy ship" Wappen von Hamburg, respectively. Both come with pretty generous sets of figures. (At least they did under their original labels; I assume the figures are in the reissued versions.) I'm not sure of the exact scale of those kits, but they're pretty small. As I remember, they're in sort of generic seafaring clothes - probably no hard to make look Napoleonic. Those figures might be close - and even if you throw the rest of the kit in the spare parts box, the price per figure will be considerably lower than you'll pay for the equivalent number of pre-painted N-scale ones.
That's the best I can suggest - and I'm afraid it isn't much. Good luck.
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