You could contact people on the Racegun forums and see if you get any luck there. Other than that I don't think you can make one without finding the special port that race uses. I'm sure you could contact newraceowner and you could send your gun to him for setup and then he might part with a charger if you tempted him with the right price. he has said it before. Other than that your only other option is to pickup another race frame that has the charger and data cable.
Round body Merlin, Evil-M, 03' Viking, Z-Force