1. Laine is a RW, period. That being said, you could rotate Armia, Laine and Ehlers to make all of them play their respective positions (EPL, CLA). I have my doubts about Perreault playing center, but we may not get to choose.
2. By far the best option out of these three. Roslovic would have a line driver playing with him, and we could shelter Roslovic and Laine to an extent. The bottom six could be rotated nicely as well.
3. I don't see Wheeler playing C for too long, nor do I like that idea. I'd prefer keeping Wheeler where he is at his best and replacing Scheifele with an actual center.
Combining elements from these three lineups and my own preferences, I'd run with...
Ehlers-Little-Wheeler
Perreault-Roslovic-Laine
Copp-Lowry-Tanev
Connor-Hendricks-Armia
The basic idea is that Little becomes the 1C that is assigned with the toughest of matchups. We keep the Lowry line together, for without Scheifele, we need Lowry to take an even bigger responsibility over covering the tough matchups that Scheifele usually gets. Since CLT has proven to be successful in that role, I'd like them to remain intact. This way, the second line can be sheltered; Roslovic needs to be insulated, which is best achieved by giving him a line driver to work with (Perreault) and limiting his tough assignments (Laine needs this too, hence why he is the best fit to be the other winger). Connor is the victim of these changes, but he has been on the fourth line in the past, so that's somewhat likely to happen anyway. If needed, we could go Connor-Lowry-Armia and Copp-Hendo-Tanev, but I like that shutdown unit a bit too much to go with those lines by default.