Be a bit more creative with the trim.

Or add trim to make it appear to be a Shaker style door. Frankly, it would be less work to have simply purchased new prehung doors that came with trim.

I dont think that adding trim always looks bad. I added trim to my flat, plain bifold doors. I think the trim would make your doors look brand new. I would add molding to those doors and paint them. I agree with your husband, staining would be a nightmare.

Save up for new doors and hardware. They aren't that expensive.

Move the stop? I dont know what that is. I would go buy some trim and a tube of adhesive caulk. I would put the trim up so that it does not hinder the door opening and closing and then paint it.

I had flat doors too. I painted them a different color and changed out the knobs and hardware and it made a huge difference.

Since you are not staying in the house, sand the doors lightly and recoat with a clear finish, as Lisa Fouts says. Clean up the original hardware and reinstall it.

What's wrong with me?? I like those doors!

I have 1956 ranch that has quite a long hall and I replaced all the doors with textured glass and I love them they let natural light from the rooms into the hall and they provide privacy for the bedrooms and the bathroom.