To "Japan" (I think) also means to "Japanize".
and if so, the following scans better:
> Yanase Japanned proper
> James's jumbled jabber
3japan
Function: transitive verb
Inflected Form(s): ja·panned; ja·pan·ning
1 : to cover with or as if with a coat of japan
2 : to give a high gloss to
- ja·pan·ner noun