I would thinkit would work great although you should wait till someone who knows more than me chimes in.

I wouldn't worry about tapping the buds at the beginning, the pollen is carried by bees and bees don't visit buds. If a flower or two is already open, pinch it off befor bagging the truss. Just put the bag over the bud truss as soon as it is large enough. When fruits fill the bag take it off and pinch off any remaining flowers or rebag them. I use pieces of fluorescent flagging tape tied around the truss to mark the fruit for seed saving (I bought the tape for plant name tags... tied to the cages/stakes.)

Walking around and whacking the cages/stakes with a stick mid morning helps boost self pollination rates and fruit set for the whole plant. I wouldn't bother concentrating on just the bags unless you want to vibrate them with a small electric motor (toothbrush, electric shaver etc).

Thanks for the advice.

Some varieties will drop a good amount of pollen just from the flowers being shaken. I was just concerned about the wind carrying stray pollen grains from one flow onto another set of buds, and the grains might somehow end up on the stamen of a bagged flower...I know it's almost impossible so I won't worry about tapping off "stray pollen".

I always tap tomato blossoms to encourage pollination; bagged trusses won't be an exception.