I didn’t scroll through this whole topic, but keep in mind that HDR ( or Dolby Vision for that matter) is making a lot more impact on image quality then the number of pixels (1080p vs 4K). My advice: avoid the (ultra) cheap tv models. Often they are labelled with the HDR tag, but in reality they actually really aren’t.
If you can, save some extra for a proper tv: Buy LG OLED55CS6LA 55" Smart 4K Ultra HD HDR OLED TV with Google Assistant & Amazon Alexa | Currys
I know it’s a big difference compared to what you have in mind but i really pays off on the long term. Is your tv primarily for MSFS, or other purposes as well such as streaming movies and series etc?
Personally, i have really good experiences with LG Oled’s. My 65" LG CX is still doing great after 3 years, and my next one definately will be LG Oled again.