There are a variety of RF transmitters available in the market and it’s so easy to even make them yourself. You can also find kits which help you make your own transmitters and receivers. If you can mention the output power and/or range of the transmitter, it might help me narrow down some RF transmitter sellers in the UK.
im no expert on that gun by any means, but i would think that the ripclip on its own will be able to keep on time wise as is, rip clips are pretty decent and hit high bps anyway