Well you dont sound that fussy to me
The key to making it 'not like a diet' is to make small, hardly noticeable changes that you can maintain for the rest of your life. Because that's what you will have to do, if it isnt going to be a 'diet' . It willl be healthier eating
So you eat salmon, cod. Wrap salmon up in foil parcel and bake it either with lemon, or pesto or olive oil. Serve with salad, or new potatoes (not too many and not dripping in butter)
You eat chicken, have chicken breast cooked the same way (I wrap in parma ham or with a small slice of strong cheese inside) and again have with salad.
lasagne,pasta,quiche okay as long as not huge portion fill up with salad.
Eggs are great, make 2 egg omlettes ,again with salad (you're going to be eating a LOT of that or sliced toms, whatever floats your boat that isnt too carby.
See how much you can do!
I would give the pie and mash a miss tbh.
BUT BUT BUT STOP BUYING SWEET CRAP. You cannot buy it anymore if you cant stop eating it. It will only encourage you to sabotage your good intentions. If anyone moans, TOUGH.
You say you dont like veg, I'm not a veg fan either but I DO love making veg soup (smooth, not lumpy) and when the weather gets colder its a great filler upper. Try it, you might surprise yourself