Most non-waterproof trousers I've used were uncomfortable when dampt. Some held off the rain for a while bit bur then wetted through and took ages to dry, while others quickly became damp but dried quickly. I have a pair of nylon North Face Horizon trousers that fall into the latter category, but many other companies make similar ones. At the moment I favour the Quechua Forclaz 500 trousers sold by Decathlon, which are a very light and quick drying softshell, and also cheap.
Other options would include Paramo trousers or others made of similar materials, which are comfortable worn all day, but only in cool or cold conditions. Rab Vapour Rise trousers would also probably be relatively comfortable when wet, but are cold weather garments.
I don't like wearing over trousers and only do so when it's really raining, when they become the lesser evil.
I was having a mooch around Go Outdoors when I spotted this pan set and thought it looked very good for anybody wanting to cut the weight of their kit without spending much money. For £7.99 you get a 1l and 1.4l pan, two lids and a pot grab, weighing a claimed 263g (probably about right from the feel of it). Admittedly the aluminium felt very thin and a bit of care would be required not to damage the pans, but if you did dent them I suspect they could easily be bent or hammered back into shape. Also, there was no non-stick finish, but for just heating stuff through this should not be a problem.
I've seen a few tarps which don't cost that much, like the Alpkit Rig 3.5 and one made by Vango. I've also seen a tarp in Decathlon for very little money. The poles supplied with the latter two probably weigh quite a bit, but you might be able to bodge something lighter with a walking pole or pole salvaged from a cheap tent.
I have an Edelrid adaptor which allows me to use MSR and similar stoves with piercable cartridges, which you can get just about anywhere in France. I bought it about 20 years ago after a trip to Portugal, where screw top canisters proved almost impossible to find. I only saw them in one shop, which was closed at the time and not due to reopen until after my girlfriend and I were supposed to have embarked on a bus to another town.
It's only been used two or three times since then, but has worked well when needed and more than repaid the few £s it cost me in a sale.
It's the standard Forclaz 500 trousers I have, one pair of which I'm now wearing, as I do in many casual and work situations. They are "technical" trousers but without the multiple pockets, contrast coloured reinforcement patches and venting zips found on many walking/mountaineering strides. For me, they're all the better for this lack of bells and whistles.