Just what is the length of the runway that you want to use, not the 8,200 foot runway? The shortest runway I have operated a 900EX or a 50EX off of was 4,000 feet long at SL. Never near max GTOW on the 900.
If you posted it, I can't find it.
Oh, the only airport I told the boss no was St. Barts (2,100 ft), but I don't think he was that serious. I was.
Also, doesn't somebody base a 900EX at London City Airport?