"In europe you require 2 crew by law for AOC work
That's definitely not correct, as stated. Plenty of G-reg piston twin charter work is done single pilot."
There are also other AOC-required ops such as traffic spotting for a radio station; again single pilot.
AFAIK it depends on whether the particular aircraft is certified for single crew, the type of flight being undertaken and also the rules of the jurisdiction that the aircraft is operated under (N or G reg) and in (based out of USA, UK etc...).
I thought the Eclipse was going to have single crew certification under part 135? I may be wrong.
SB