Hi, should I use a door pair maker on my French door leading from my living to dining room or just leave it flush?

Personally no Georgian bars on the doors, but its personal preference. If its just the doors and no windows in the dining area it should look fine, and will have a complete clear view out?

Hi, have you considered a timber alternative windows and doors, which look like timber, but are infact foil wrapped upvc, therefore cheaper? I would consider Bygone sash windows (timber alternative) and Evolution windows for your timber alternative french doors.

I would match the doors to the wall but thats just me. The curtain fabric has quite a strong pattern so I wouldn't want to compete. That said sometimes a darker frame looks great against a paler wall. I don't think you can get testers of F&B eggshell. Paint it lighter and then if you don't like it its not so difficult to go over it with the darker paint. I like your colour choices and I think it will look very sophisticated when complete. Just a thought, consider the natural light levels in the room before making a paint decision too.