You could buy a key card such as this one https://page.auctions.yahoo.co.jp/jp/auction/e471086307

Then message isicar to see if they can program the card to your PGM. You would probably have to send them your card and PGM.
https://www.ebay.co.uk/itm/DONE-IN-JAPAN-HRC-CARD-CONVERSION-SERVICE-FOR-HONDA-NSR250R5-SE-SP-MC28-PGM-IV/202753034553?hash=item2f3505c939:g:foQAAOSwW1NdwNEl