I think this was fixed on Plasma 5.27.x onwards. There was major rewrite of display configuration handling, that fixed these issued for me at least.

Sounds familiar.

I’m using TBS octa DVB-T(2)/DVB-C tuner card, which is streaming the channels to my LAN (by using Tvheadend, Mumudvb, or Astra), but I was also frustrated about compiling the driver for it whenever there was a kernel update (https://github.com/tbsdtv/linux_media). Eventually I created a Debian virtual machine and configured the tuner device available for it by using AMD IOMMU and Qemu/KVM PCI pass through. It has worked very well, and there’s no need to update the kernel if you don’t care about the security and vulnerabilities ;D

The card I’m using: Multimedia controller [0480]: TBS Technologies DVB-S2 4 Tuner PCIe Card [544d:6178]