Personally I think the 35k isn't a bad shout in fact pretty good. The Sovereign sort of falls between two stools, the next aircraft up is the Chally 300 (which needs a fairly experienced FO) and the next one down is the Excel. We all know the 680 is a slow stretched 750. My point being you dont need a particularly experienced FO on what is an extremely good into Europe machine with an occasional trip to India/US for example. Bet you'd get a cojo agreeing to work on an XL for 30k think EBJ/LEA so 35k on a 680 is about the mark, you would no doubt get a captain of industry or a CP trying to get it done for less
IMHO