I'd like to add bluetooth to my PMID 4311 so I can use a bluetooth keyboard with it since most of the keyboards without a case seem to be bluetooth. I figured to do that since it doesn't have bluetooth, I'd have to plug something in the usb port to make it bluetooth and then plug the keyboard into that. Thing is I have no idea if anything like this exists? If it does, what is is called and is it available on Amazon? Thanks for any info. 