The 350 im in has a Proline, its so nice compared to other KAs I've flown. Okay, back on topic, I would assume (I know, I know about assuming
) that it would be fine to sit as SIC although you may not be 'current.' Forgive me for not remembering any one website (maybe, findapilot.com), you can upload a resume as a contract pilot and just state how much time you have in the 350 and that you dont have a current type. I've had several friends use that site and get a few hits doing it.
Not very helpful, but best of luck!