Glaramara- apart from the rocky summit the route down thorneythwaite is a good ride from memory, a bit vague above raven crag becoming a fun, all rideable good path. Its many years since I rode it but often there on foot. Can’t comment on east side, can’t imagine it being much fun.
Gable- SE ridge is a steep pitched path, maybe ok if you like that sort of thing, not my bag, and agree aaron slack isn’t great either.
Great trip report- I wouldn’t go over to scafell pike from GE for fun with a bike, it’s bad enough on foot!