It is a bugger of a starting point as getting to a trail by bike either involves some serious hike bike up to High Street or across to Red Screes. Not sure cycling downKirkstone or the Struggle to start a ride is a great feeling. However, if you don’t mind jumping in the car you can start somewhere a little easier.
I’ve never done the hike up Raven’s Edge and John Bells Banner but the is map says it is quite tough. The climb/scramble up to Red Screes is worse or similar.
Starting in Patterdale or Troutbeck or Ambleside gives you loads of great ride options for whatever the weather brings.
Helvellyn is a good option if the weather is kind.
Some sort of loop from Ambleside over to Elterwater, Coniston, Grizedale, Claife, Clappersgate and back.
A loop around Ullswater shore and Boredale is good shout for low level el stuff if the weather is fouland there aren’t too many walker’s.
From Troutbeck you could head over Garburn and do Nan Bield or variations on that. Or go towards Ambleside and any number of loops.
If you do go for bike hike abike from Kirkstone it would be quite a ride. You could do High Street and then Ullswater shore, up Helvellyn, down Dollywagon, up Fairfield and try and make it across Scabdale to Red Screes and Kirkstone. My guess is there is a reason folk haven’t done Fairfield to Kirkstone…