You should be able to do three panels in those windows up into that arch with horizontal louvers and fully functional. Your shutter maker just needs to line vertical posts up where you have vertical mullions! giving that center shutter something to hinge to. Here are a couple of similar windows I have done. It's a partial arch but it's the same concept with yours

there are companies who will spray paint your shutters with a 2 pac finish that will bring them up like new again however it is costly, about half the cost of buying new shutters. If you are interested in this, send me an email and I will give you the name of my contact. Otherwise, consider adding drapes in front of the shutters in a colour that complements your new room colours or in white. Finally, depending on the location and functionality, maybe replace some of the shutters ( if in more than one room) to simpler blinds and only have some of the shutters professionally treated.

Yes you can and in your case I'd go for a bi-fold plantation shutter that folds to the left and still gives you access to the cabinet on the right... e.g. it will look like the "left half" (if that makes sense) of this... with the top or bottom (or both) 'bi-folding to the left, e.g. like the top of this (slightly wider in your case)...

Sorry haven't had any personal experiences to share but here are articles on Houzz you can check out on this topic – [High-Performing Shutters That Both Protect and Decorate Your Home[(https://www.houzz.com.au/magazine/plantation-shutters-are-they-right-for-your-home-stsetivw-vs~89935440) [Hardworking Plantation Shutters Deliver the Goods[(https://www.houzz.com.au/magazine/hardworking-plantation-shutters-deliver-the-goods-stsetivw-vs~39453769) Good luck!