the bosh! cookbook has some nice vegan recipes in, not all gluten free although you can adapt (I made a gluten free version of the raspberry and dark chocolate brownies and it dropped to bits but tasted fine)
tinned jackfruit isn't hugely expensive and is good in tacos, you can do vegan/veggie kebabs with peppers, mushrooms, aubergine, onions and some halloumi for you if you fancy, dh can have rice instead of a flatbread with his
gram flour is your friend, I make vegan gf 'omelettes' with it, just mix a bit with water (and/or plant milk if you feel fancy) until it's roughly beaten egg consistency, season, fry in a pan like an omelette, have with salad, falafels or whatever
lidl and Aldi often have a lot of gf vegan stuff in that is reasonably priced, I am slightly obsessed with lidl's sweet potato pakoras, they also have a lot of 'superfood' type stuff in cheap like coconut flour, spirulina etc
vegan chilli, make a double pot, keep some back for dh to have on a jacket spud later in the week while you have cheese of whatever on yours
there's other shortcuts you can do when someone is on a diet where you have to cook from scratch a lot: buy frozen chopped garlic (or peel and chop a massive load in food processor and freeze yourself), same with chillis; chickpeas and other pulses are cheaper if you buy the dry ones but they need all the boiling and soaking, so again, I will do a big batch from time to time and freeze in similar portions to tins; slow cookers can be good for things like stews and curries - it's all just planning and trying to create a store cupboard/freezer set up where it's not that hard to whip something up even when you really cba.
nutritional yeast, garlic powder and onion granules are my holy trinity, I stick them in stuff to make it tastier