Pulp figures if you want an alternative period choice but you could also look at Foundry Chinese pirates and less so the Opium Wars and Boxers. Redoubt and Old Glory also do Boxers and some would work very well. The other Chinese ranges that spring to mind would all be too far out I would think, TAG, Curteys, Renegade, JJD etc.
Copplestone, Pulp and the Foundry pirates are your best bet.
Svennn