I live in Manchester and have not seen a word about the Jays considering playing here. The NH Fishercats are Toronto's AA affiliate. We have a 6500 seat park along the river with a Sheraton hotel in the outfield. (No, really.)
https://stadiumjourney.com/stadiums/northeast-delta-dental-stadium-s273
It's 15 years old. I don't know if it has LED lighting or if the clubhouse and player facilities are MLB quality. (Probably not.)
While there is that one Sheraton hotel next to the stadium, it's a few blocks before the next closest one, but that's it for downtown. All other hotels are in the outskirts. So there are nowhere near enough to house visiting teams.