The Kelly Kettle is a lot more fun, but campsites are wary about fires (both because of damage to grass and also because tents are fairly flammable...).
If you want something a bit more stable than the "screw on top of a cannister" style stove, then how about something like this?
http://www.gooutdoors.co.uk/campingaz-portable-gas-stove-p321994
That takes cannisters that go into the side. I'd be happy to use that inside a big tent like you have.
(I assume you already have the next step up from that, which would be a two-ring stove which runs off a big heavy gas cannister.)