I was thinking about that PlayStation (PS1/PSX) *slim* I did the other day and thought an HDMI mod would be nice. (digital-to-digital)
Same GPU as on SCPH-555x boards that PS1Digital/Retrogem use, I think? Not sure about digital audio - lots of address and data lines between SPU/CPU though, maybe doable.
Anyway. Don't remove the analog AV port. Remove the power jack! Replace it with USB-C and do video output on that, alongside USB-C power input.
I can see it in my head. I might research this.