what I was trying to say is, use everything you have there to track the footage, either within after, or using mocha.
Then as the folder is blue I would use keylight (effects panel) to mask out the blue. just put this layer ontop of everything and this should put back your fingers without the need to rotoscope anything.
The “simple masking” I was referring was that if you had anything else blue going on, maybe you would need some loose masks on those to make it work. (e.g blue glasses and he had lifted the plate for a few frames)