I'd be interested in a centre to centre-left social liberal party. I suppose I could join a social democratic party if a liberal one didn't emerge.
I'm in the same boat as BaconBacon - we seem to be lacking parties between TNF's communists and the right (not sure what to make of the Socialists).
I've created a new political party which might fall into several of the categories Afleitch suggested in the opening post, and might be a good fit for you two.
https://uselectionatlas.org/FORUM/index.php?topic=216254.0