Jack,
It seems the solution to your needs would be one of Trangia's own kettles, as they are designed to work and fit (?) with Trangia cooksets (I would hope they would work with the triangle too) or do you have an issue with Aluminium?
I currently have an Optimus Terra 0.7 litre Hard Anodised Aluminium kettle, it does just enough for two mugs, the Trangia just fits inside, with a freezer bag with fruit tea bags...and lives permanently in the backpack......I'm looking for (probably) 1.5 litre for the beach hut, stainless appeals as salt laden air corrodes everything.......
I still haven't ordered an Eagle yet!.......decisions, decisions.....
Paul
Yes, I have the Trangia 25 kettle. I also need something a little bigger (1.4/1.5L) to avoid have to heat up two lots of water when all 5 of us are having a drink. I want to avoid unhardened aluminium. It's a pity Trangia don't make one in SS or hardened aluminium.