I don't think there is any way outside of a rash of injuries towards the end of the season that would even make Perreault a possibility to play with the Rangers this year. Size/speed/whatever there just isn't an open top 9 spot for him. If the FO isn't serious about addressing the Lindgren sized problem on defense it isn't worth burning a year even if he could help.
He's got a wide open lane to make the team out of camp next year though, especially if the coaching staff remains the same (even if he doesn't deserve it.) I'd be shocked if he spends a second more than what ever he might play on an ATO in Hartford. If this team doesn't bring it home this year, the roster is going to be very, very different next year and even with his size and skating concerns, I actually think he's our most NHL ready top 9 prospect (yes, even ahead of guys like Othmann and Berard.)
2 and to the show is the exact route that Stepan took to make it to the NHL and I think if we're looking for past to present comparable thats the one we should point to, not Kreider as their profiles as prospects are way more similar.