Co2 "Pilot Light" For Small Tank

Is there anything that pretty much just screws on the top of a small propane tank.(Think Coleman Lantern Size Bottle)

I am looking for something to screw on and just be a small adjustable flame just like a pilot light on many gas system's. For small grow areas this sounds like it would be WAY better than the yeast method and would be cheaper than dumping 600 bucks into a co2 generator which would take up too much space anyway.

So is there anything like this? If not I will be building my own and will report on how you do it the right way and the safe.

When you think about it, its actually very simple to acheive this if there is nothing I can go out and buy which hopefully I can. I will make this out of brass on a lathe and bridgeport machine.
 
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