British naval figures can be bought from:
Perry Miniatures Sudan range,
Copplestone Castings Darkest Africa range,
Ironclad Miniatures have sailors, some armed with swords
Parroom Station Miniatures had British sailors armed with rifles and some with Cutlasses.
Prussian Navy will be more difficult. I have some Brigade Games WW1 German sailors who are fine for VSF.
If you want unarmed deck crews then look ar Redoubt Miniatures ACW range of sailors and Oshiro Miniatures has a pack of four unarmed Japanese sailors. When painted up they easily pass as Europeans. The naval rig is the same .