Seeing as this is a monitor without any up scaling anything lower than 4k looks kind of blurry ! 1440p is just ok but if i had to play at 1080p on it , it would look worse than a 1080p screen. 40" at 1080p would be yuck .I’m sure you don’t need to run your current one at 4K.
I have a 4K and just pick a lower resolution to to match my other none 4K and change back when using photoshop etc.
just thought it may save you some cash and desk space.
Nice suggestion though Im convinced on the 27" triples though .