Hi,
You'll have to speak to Gatwick, - I'd say it's unlikely that they'll grant it to you, but you never know.
Have routed Handcross, Mannings heath, Southwater a few times, under F'borough Lars, who kept a close eye making sure I didn't clip the zone.
All I can say is to ask, be as concise and tight as it gets with an entry/exit point and timings, and very accurate hight & headings aproaching the zone.
AA