I decided to just remove the front section of headliner and not replace it. I know it really helps to deaden acoustics and it keeps condensation down, but I've just never been a fan of headliners in Rovers (I did save all the frameworks and screws though). The rear section headliner was actually missing already anyway.
We all have our own preferences as to what is right for ourselves. You mentioned the headliner reduces interior noise and condensation but have you thought about thermal insulation? When I cleaned up the front interior of my truck I went with insulation on every interior surface and full factory deluxe interior panels. Not only was it a LOT quieter than being inside an echo chamber but the truck maintained temperature much better. When I was putting the insulation on the underside of the front roof I added it in stages. One thing I noticed was when I put a hand up on the ceiling while driving, the insulated part was at interior temperature while the bare aluminum roof section was really cold making the interior air colder. My Kodiak heater does a much better job of keeping the interior toasty warm during those freezing winter days.
I'm a big fan of traveling in comfort with a fully paneled and insulated interior, heated windscreens, and heated Defender seats. Warmth and comfort in the winter, mmm my favorites.