It's a good team to go to as they are very injury prone and not overloaded with wingers. They seem to be the team that struggles most at the back end of the season, so he might get the chance to shine when someone is forced out.
From looking at their first team, they only have two other wingers in their squad: Daniel Toupou and Jaxson Paulo. I know that Suuali often plays on the wing, but I'm pretty sure that is not regarded as a permanent thing.
Toupou will be 33 by the time Lewis heads out there, so perhaps past his best as a winger. The biggest risk for Lewis is that they will seek to attract an established winger for that season rather than having an untested Brit landing the slot.
Good luck to him though. If he does as well as his potential suggests, even if he doesn't get a gig for the Roosters, he'll find a slot somewhere.