If they don’t want to bring Torchwood back or can’t get the original team for whatever reason, how about a Torchwood set at the turn of the 19th century?
Alice and Emily and Charles. And Jack Harkness, of course. He wouldn’t even have to be a regular character since he was more of a field agent back then anyway.
I’d watch the hell out of a show about turn of the century lesbians (maybe Emily is bi?) fighting aliens.