I’ve been doing a bit of surfing and I found a website which has low carb veggie recipes called http://www.allrecipes.co.uk. I’m sure there are other websites too.
Apart from Quorn, I’ve never liked the meat substitutes they laughingly call ham or chicken. But if you enjoy them, perhaps you could just have the meal you mentioned a couple of days in a row so that you use it up before it goes off. I often find that menu plans have too many different dishes in one week and so, as you say, you end up wasting some foods that you have only eaten half of. So I repeat the dishes once or twice in the week to use the food up and then change the menu for the next week and do the same.