Foglight surronds - no
Hood Air outlets - yes (use OEM)
mirrors - no
door handles - no
gas tank lid - hell no.
door pilars - no. too much prep work to accept paint. probably would chip after awhile from repeated handlings.
roof rack - maybe. paint would probably chip. you might have to get it sandblasted and clearcoated.

What about titanium window surrounds? Use the chrome surrounds from the non-sport X5's, hit them with steel wool to get a matte finish, and clear coat them for a titanium appearance? Your pillars would remain black for contrast. There's a couple of others X5's modded similarly (Kuwaitano) and it looks good IMHO.