I live with 3 meat eaters and it can be a juggle but I agree with pp who said, work with yourself first. I was brought up a meat eater and have to admit to liking a few of the meat substitutes (i know not every vegan does) but I try to limit them to once a week, twice at most. But this last little while it has been more, the meat eaters had steak last night for instance for a birthday meal so I had a beyond meat burger. And then they had bacon butties today for breakfast so I had a vegan alternative. This is unusual though. I'm not keen on quorn and a lot of alternatives have wheat in them which I can't eat so I suppose I am quite limited anyway.
These meat alternatives aren't always difficult to cook separately so maybe you could have a lentil/bean/nut/vegetable based dish and your husband can add on a meat alternative if he wants to? And in time he might decide the dish itself is enough.
Even though my crew are committed carnivores we do eat veggie/vegan most of the week for health and us all eating the same thing and im lucky that they like it. So, a lot of lentil dishes and vegetables.
I would look at what you can filter out, if you can have a non UPF meal and he adds on whatever he wants then do that for half the week. Maybe another night that you both eat a meal that is naturally veggie and then twice a week you can have a dish that is cooked with meat alternatives and both have it.
Have a think about what meals you enjoy and could make changes in. Curries with chickpeas instead of fake chicken? Stir fry with tofu? Green lentil chilli? Omelettes if you eat eggs? Then build on from there.
It is harder if you're having 'meat', potatoes and two veg type meals but even then there are things you can make as a healthier alternative. Nutmeat stuffed mushrooms and the 70s staple lentil loaf type things. But i don't tend to eat like that so much just because it's not my preference. But, in winter, if the others are desperate for a Sunday roast type meal, i will. Green lentil shepherd's pie is nice in winter
It does take a bit of time to relearn how to cook with these things though so just experiment til you find one dish that you like and go with that for now.
I think making small changes each week is much more sustainable than throwing out your whole way of eating.
Basically, fake meats can be a nice addition to a healthy diet but you are right that it's not great as the main stay of you diet.
Head over to the vegan board. "what we are eating today" type threads, there are always such delicious ideas.