Yeah it would work to put in a bowl that it open. I personally have never used the enclosed kind, im unsure what you mean by that. The best way to put out a bowl is to cover it with something that will cover the whole bowl and wont melt. No oxygen means no burning. Hope this helps.

Grinding up weed is always the best option. It is always best to use a screen with ground up weed otherwise it will just fall through the hole.