There’s a ramen sauce that makes ramen soup I like. Add that to just the dry noodles they sell- not the packs of ramen- and it’s very economical and better quality.

Anything works in ramen. If you have a freezer I’d suggest ham is a very very cheap protein to add if you can buy in a large size.

Otherwise, sprouts are good and inexpensive. So are mushrooms. Turkey is cheap but in bulk like ham. If you’re aiming for less bulk chicken thighs are inexpensive and good in soups.

If you want something like frozen broccoli try peas. Peas are great.

If you brine your eggs in mirin and soy sauce they will work even better in the dish.

If I understand you correctly you want the door to unlock when you’re at home and approach the door?

That doesn’t strike me as a good thing.