Would be nice for us to get involved with this sort thing but sadly the C130J has a fully developed, trialled and operationally tested wing-pod system in use with both the USMC and the IAF.
Thus it would take at least 10 years and £450M for BAe, Marshalls and Qinetiq to implement, design and test a system for the RAF. From what I've heard, the mooted RAF system involves throwing paper cups full of fuel off the ramp at passing aircraft.
