BBK,
Yes, several infrastructure options were looked into. All far too expensive and also difficult to work out where they would go. It also creates a logistical nightmare for the engineers. If you can only engine run in one location but need a lot of engine runs doing it drains the man power and man hours through towing the aircraft back and forth. Nothing would ever have been achieved.
The Yanks had just build something at Mildenhall for their MC-130s and this was investigated but again, way too expensive.