The RAF shy away from this as the individual has to be regarded as a 'member of staff' for insurance purposes and H&S@W. These comments are based upon experience trying to get ATC Cadets work experience for one day.
My advice would come in 3 parts: Firstly logic would have you believe that getting a guy at uni onside can only be a good thing, but the service does not run on logic. Try the RAF CIO who may have come across this before.
Secondly, why not approach one of the many civil contracters working at RAF stations. This may result in the loss of a candidate for the service, but that is life. FBH - SERCO - Shorts - Marshalls of Cambridge etc.
Thirdly, find out who your regional schools liasion officer is. It will be a Sqn Ldr probably retired officer, whose job it is to deal with these sort of things. The Midlands has one based at Cosford but covering a wide area including many RAF Stations. BZN may have your nearest one, or indeed he could be on unit.
It will appear patronsing referring a university student to a schools liasion, but in the RAF all students tend to be treated the same. A few calls to the nearest UAS or UAS HQ at Cranwell may prove fruitfull. The back door , I know a mate will not work on this one these days.