The question is, what does the printer firmware support?
The firmware, is the software installed in the printer by the manufacture.
The firmware will identify the printer as a PM-4000PX.
So, when you go to install the 2100 driver, it will not find a printer.
If you can flash the firmware, you might have a better chance.
Another potential problem is default fonts.
A Japanese printer will have a Japanese font built in.
Then, there is the issue of warranty support. If anything goes wrong with the printer, you will need to send it to Japan for service.
What about ink?
Does it use standard ink cartridges?
Personally, I would forget about the 'gray-market' printer and buy a US model.
Chas