Hey dude, I read yr posts, kinda stoned right now, but I have read about the technique you mention with the baggie, I dont really have any direct knowledge on it though.
I always see pollen kept in those 35mm film canisters.

As far as your last question, yes it is possible, it is much harder though. I am experimenting with this right now, and quite honestly...it dosent look good so far, I think I got an embalism or something, as the leaves are drooping a little today.

The further you are into flowering, the harder it is to clone.