FFF - one of the last things I did, when directly involved with a Florida flight school, was to arrange with the UK CAA to open an examination venue in Orlando.
It is, technically, a joint venture between three flight schools that I managed to get to work together, for the common good of their combined students - but the deal I struck with the CAA was that any candidates should be able to use it if there is sufficient spare capacity at any particular sitting.
When I set up the venue, the schools agreed that a "venue charge" of around $250 per sitting (not per subject) may be levied for "outsiders" - but this is much cheaper than travelling to Gatwick by air.
Note, however, that despite an original decree from the CAA that the venue must be available every calendar month, it does appear to be operating only when any of the three schools require it (as it has to be paid for).