are there many rideable routes out of Buttermere?

I have done the red pike/high stile/high crag ridge in the past, I have done scarth gap down into ennerdale.
the roads up newlands and honister do not look too inviting.
and whinlatter has been done a few times.

anything else?

Legal ??

Floutern tarn BW… a god awful bit of trail but it gets you over into Ennerdale.

Wharscale BW up to Fleetwith, incomparably better as a descent.

Others, well, the classic Rigg Beck into Newlands is Ace as you know.

Road from Buttermere over to Newlands isn’t that bad really. The only trouble is unless you go cheeky its road own the other side, then push up on cat bells and down the other side to grange, though the switchbacky steppy bits near the top are pretty tricky going
Cross the river at grange, nip off the road briefly past Bowder Stone, carry on the road through Rosthwaite onto Seatoller and up Honister (opening sections aren’t great but it eases off as you climb)
At the top head up through the quarry and up and over the bridleway into Wharnscale bottom. This has plenty of very testing sections too though.
If the visibility is bad, it may well be easier to navigate by cutting actross to the old tramway once you’re on the tops as the main track disappears into the piles of slate spoil

Scarth Gap to Ennerdale, up the Tongue, skirt round to the right and then climb on to Great Gable. Descent to Styhead, then to Borrowdale. Ride up Honister Pass, then descent Warnscale Bottom. Awesome.