I am quite sure it is possible.. I have attempted to graft, but I shake too much, and have issues with tension in my fingers.. I am either squeezing hard or my fingers dont move much. Nerve damage from smashed hands from a 6.2 Detroit landing on them doesnt help.. not knowing how much I am squeezing etc....
Just imagining trying to use a paint brush from what I remember made me lift an eyebrow.. I think grafting is like juggling.. takes some practice, but when your good.. your good!