Despite having played 18 games in RF last season and the site listing him as a 1B/RF he doesn't have the eligibility?
He does: fleaflicker.com
Where are you having trouble plugging him in?
In the general OF slot. It only gives me 1B and Bench as options.
I looked at your league, it allows you to start him at OF. Ensure you have an open slot there and they are all not filled.