Alcohol simmer stoves: these Brasslite stoves are GREAT – I have the ‘Turbo 1-D’ (47 grams) and the ‘Trailbaker’: http://brasslite.com/stoves/products.html Aaron now makes leg extensions for them to improve stability. these would be excellent providing you can fit them in your pot (Check!)
PS: These make a great gift. They are cheap, attractive and beautifully made.
Another interesting simmer stove is the http://packafeather.com/stove.html They may take up a little more room in your pot, but work well and are very stable.
I previously used the lightest Minibull Designs stove (https://www.minibulldesign.com/ProductCart/pc/home.asp) which weighs only 7 grams. It is also a great stove. It is exclusively a ‘boiler’, so ‘fancy’ cooking such as frying or simmering is very difficult. I still take it on superlight overnight trips where I carry only a day pack, or as an extra stove.
