Guessing this is probably a 'no', but are there any sites that allow open parlays in the same vein as 5Dimes where they would let you parlay alt lines and have a wide selection of soccer? I've only played on the A+ books, but I'm wondering if there's something in the slightly lower tier (A-B books?)

Heritage: Allows open parlays, but not in their Soccer Plus section (regular soccer offerings are pretty limited). Best option though.

Bookmaker: Only two slots for open parlays.

BAS: Offerings got cut tremendously after moving off 5Dimes backend

Bovada: Think they either stopped allowing open parlays or have very few slots like Bookmaker.