You're asking a military power which has embargoed another nation which it is at war with to simply ignore its citizens funding the enemy cause? That would more than likely have been treated as treason during the Revolutionary War.
Treason is a crime against one's country. Back then, the US was NONEXISTENT.
Really, the BAF should be pirating Samura and Kishiro, seeing as [in RP] their profits directly help Kusari. One indy trader taking cargo in or out isn't going to make a big difference.
A way a lone a last a loved a long the riverrun, past Eve and Adam's, from swerve of shore to bend of bay,
brings us by a commodius vicus of recirculation back to Howth Castle and Environs.