Hi @Pinklightning, it sounds really challenging, but good on you for giving it a go.
Agree with others a big jar of museli/granola is a good start. Oats/quinoa flakes. Pumkpins/sunflower seeds. Flaked almonds/any other nuts you're ok with. I rotate which nuts I use and sultanas/cranberries/dried apricots/prunes etc so it tastes slightly different each batch. I like giant oats but you might prefer small porridge oats. Oatiflakes in the mix add some crunch but you might prefer without. Baking some apple/maple granola chunks to mix in would up the sweetness if you have a sweet tooth? Put a handful of frozen berries for flavour, a scoop of collagen for extra protein and some freshly ground linseeds (good for fibre, protein & omega oils & much cheaper than chia). Serve with greek yoghurt (I like yeo valley 0% to offset the healthy fats in the nuts & seeds, although sounds like if you can get away from the cheese a but more you have plenty of calories to play with, so probably don't need to worry about 0% particularly!)
Lots of options on egg free cottage cheese pancakes-have a google. Anything using buttermilk is just to offset the tang of bicarb in the recipe. Use 1 tablespoon of lemon juice or white vinegar per 250ml of milk to make your own buttermilk-it will curdle slightly if full fat, but that's fine.
Soca bread is a gram flour based flatbread. Absolutely delicious & can make & freeze portions to go through the toaster. Gram flour waffles are also easy to make ahead to freeze & toast. Serve both with greek yoghurt & some defrosted berries.
Egg free greek yoghurt cornbread is another one you can make ahead & freeze.
Tempeh is a good suggestion, as is silken tofu blended into shakes/smoothies/dips. I quite like a fried egg over puy lentils with a spoon of salsa verde stirred through for a quick lunch, but could equally have at breakfast with fried tempeh instead of the egg? Any soups with red lentils & blended will also be fairly high protein.
For protein powder, hemp based may be worth a try if you'd actually use smoothies? It's slightly nutty but not as grim as pea. I struggled with both whey & pea and get on ok with it. It's actually ok shaken with apple juice as a base too. No added ingredients & not UPF.
If you like banana milk, can you make your own? We freeze just overripe bananas peeled in chunks to put in millshakes. They thicken it and make it cold. Can add cocoa powder/vanilla for flavour and hemp powder to up the protein, a bit of maple
syrup to sweeten if you like.
Don't be sucked in too much by the 'high protein' aisle. It's usually got loads of additives & costs twice as much. Normal/seeded bread, pasta, noodles, a pint of milk & a tin of baked beans (appreciate the last one might be off the cards for now) are all naturally fairly high protein. There's protein in wheat and rice, just not enormous amounts. There's protein classic vegetarian way to get all the essential amino acids is 'rice & peas' but wheat or rice with any lentil/chickpea/bean sauce you can tolerate is a good start.
It's much trickier without beans, but could you manage chick peas, cannellini beans, peas or black beans if blended? All make good soups with red pepper/leek/mint/chilli respectively. This might be a good way to gradually increase a bit if beans without the texture issues?
There are some good nutritionists out there who specialise in eating disorders & work well with homemade suggestions that may be able to give you a wider suggestions list, but hope the above helps?!