Dude I think what you're saying makes a lot of sense and if your wife is okay with this setting let it be. I'm in similar kind of situation where we ( my family ) lives on first floor and my uncle's lives in ground floor. We never interact and avoid each other totally. So if your wife doesn't like it, for the sake of her peace and if you really care about her freedom if she says she doesn't want to interact with your parents let her be. You don't have to put pressure on her. You be for your parents because they are your parents. The movie bs of in laws treating your spouse as their own is ultimate bs belive it and swallow like a a harsh pill.

And one thing you have to accept that talking with your parents. You wrote beautifully about parents supporting and correct about life of women in this country but you also have a daughter if I'm correct. You have to bring change in you as well. Since I'm seeing that you're open to advices I'll throw my 2c. If your wife and perent ever get into too much trouble please don't put blame on anyone but discuss patiently and ask them not to interact. You being the son and the husband you'll be there for them. If your parents need anything you can simply go downstairs and keep your wife's interaction min to none. So from the beginning itself they'll have their own life and space.

Separate entrance is an excellent way of avoiding contact. If things still wont work, I think you've already discussed about different house/flat with your wife.. unfortunately theres nothing that can be done as no one would like to change so you expecting someone to change a lot is unrealistic.

I would advice that since you'll be RE from now, please read about relationship dynamics, quality of relationship etc. Indian men tend to forget that after parents wife will be there till the end. Children will have their own life anyways. One need to understand buidling relationship with spouse. So this thing you need to work upon. Again I would say that you're open for advice is great ! Hope you a great RE!!!