Our first bikepacking trip (this was before we discovered the term) was from Corrour past your camp spot and up the Abhainn Rath to Meanach bothy. It’s not too bad to the bothy, some pushing and the last bit is boggy but should be OK on fat bikes. From Meanach there’s a track over to the Lairig Leacach and down to Spean Bridge.
The direct track from your camp to Spean Bridge is very rough for the first Km or two then becomes an argocat track. Might have been improved in the upper reaches by the estate since we were there.
The big problem in that area is making a sensible loop, if you’d gone over to Spean Bridge then there’s a lot of road to get back to your car and it’s pretty much all uphill.
Feels a very remote area despite not being that far in distance from Ft William and some major roads.