Bridge of Allan = Dumyat and Ochils
Stirling = Cambusbarron and North Third etc
Pitlochy = huge number of rides
Dunkeld = even more rides
Inverness = Mast, Black Isle, NC500 and much more
Golspie = Golspie
Oban = out to islands
Don’t forget that in Scotland we also now how have Ember electric buses (Edinburgh to Dundee, and Dundee to Glasgow via Perth) with bike carriers, Citylink will carry in the hold too and most of the Flixbuses will also pre-book and carry, and I’m told but cannot find details, that most of the West Coast buses also carry bikes.
Finally you can get Hannon coaches from Glasgow to Belfast cheaper than a foot passenger on Stena with a bike.
Plus of course CalMac, Northlink and Pentland connect with many trains and buses….