You can use HDMI to DVI-D cables, it passive and didnt convert signal. I use it for my bl2420z coz I think monitor convert signal with DP cable ( more strainy )
Your rtx3090 will strain you immediantly when you start linked to rtx3090 application with win10 grapfic option ( keeping your monitor connected to iGPU or 2nd "safe" grapfic card )
I suppose "bad" magic happends after nvenc module in grapfic pipeline, so you can build 3090 based PC and using moonlight/sunshine, stream image to safe PC in local net, last version support 4:4:4 ( no image compression, good for photo/video editing )