I agree with you on the clone being in a closed bag. Too much moisture, Not enough air movement or light and this one hasn't done it yet, but the first clone smelled as well. I decided to try a test. I took the clone out of the bag, put it in a small pot bottom that is about 7" across and probably 4-5" deep, then I took and put some rods across the top and placed another larger pot bottom (both very clear) over the top of the smaller pot bottom (see pic attached). This leaves a small amount of air to circulate in the "container" (which I can add clone water to each day if needed or as often as it requires it) as well as allowing A LOT more light to get in. This is just a test I thought of after reading your post and figured it can't hurt to try. Take a look at the pic and let me know what you think. Mine was/is very limp and looks to be dying and I'm hoping this will help it grow roots better. I just have to remember to check it daily to make sure the cube remains soaked. Here is the pic I took of the experiment:
I had enough water in the bag afterwards to pour it out as well. I just figured it couldn't hurt to try. If I had the money I would have bought the stuff to make Canna's clone bubbler, but it's a little out of my price range right now. If this fails, I will just save to get all the stuff to make the bubbler, but like I said, since this is just something I would have just gotten rid of after topping the amnesia, what's it gonna hurt to try?