With regard to the A380 being a nonstarter, setting aside the not insignificant political issue of the President's plane being American made, are clearance problems.

Every person that works on that production line has to be cleared to an insane level. The American companies that deal with the presidential helos/planes struggle with this. There's no conceivable way a foreign company, much less one that builds pieces of their plane in multiple different countries, could ever get through the hurdles to get all the required personnel cleared.