It sounds very interesting, power! And I think it just might work. You would have to do a hell of a pruning job, making sure to leave some of the leaves in place for that last bit of effort the male will need to exert in order to bust his sacks open. Your timing would definitely be the most important part. It seems to me, and I may be wrong, that you would need to put the "condom" on right before the sacks opening and releasing thier pollen. You wouldn't want the bag to stay on for too long, maybe it could mess with the plants CO2 intake on the branch you bagged? I dunno, maybe not. if you left enough leaves in other spots maybe they could make up for it. but for how long?
The reason I am wondering is because I am in a similar situation, and I want to make sure I don't mess up my potential fathers. I was thinking about taking my breeders and moving them outdoors untill the end of the season, letting them revert back to veg, I would also be able to take clones off them. Anyway This would work, plus It would allow me to crossbreed my indoor and outdoor seeds, perhaps creating G13 Haze hybrid I could grow outdoors here. I have outdoor plants in my indoor garden too though, Blackberry to be exact. Up until I read this, that was the only way I could think of. Still don't know though, I have 7 possible crosses if I wait till the fall harvest, and only 3 if I do it indoors in the middle of the season... So thats more chances of hitting the genetic jackpot... Fuck, I dunno what I'm gonna do about that, lol! I think I wan't the selection, but I might do one "dad" this way, just to get a quick seed run and preserve some genetics.