The following is a link to someone who already makes and sells the adapter like what you are looking for. I have no affiliation with the site and I myself have not purchased from there. I have seen however many posting of other XRB owners who have.

http://www.rickyblazerc.com/

I highly recommend you reading/skimming through all the Hirobo XRB related threads in RCU and RCGroups. There is a lot of good information out there that will answer most of the questions you will have while you are becoming familiar with your heli.

Search the forms! I know it is easier to just post and wait for answers, but there is a lot of great information already out there and you will find what you are looking for faster than waiting for a reply to a post.

Cheers and Happy Flying!