Are you fitting extra tanks? Tip or ferry? If so I don't think you'll have too many issues with availability to be honest. Pittspilot is absolutely right. A good agency is a must. We ferried a twin piston to the Middle East with a poor one and it made life very tricky. Find the one who is used to dealing with Pistons. Our problem was it was the normal company who are excellent......for all things jet A1 powered.
However unfortunately it's all going to cost. Your example in Luxor I suspect is accurate. There will be the obvious rip off merchants who see you coming again a good flight planning company should have all this nailed down better than you or I would manage.