I'm posting this for posterity because I couldn't find a definitive answer to the question: Can I watch german h265 encoded DVB-T2 with just the RPi4 and a TV uHat without any server? ( Maybe my Google-Fu was just too bad )
It worked fairly flawlessly. I had to get some german channel definition onto LibreELEC and mess a little with the max channel allowance for the user, but then it works really fine. Channel switching is a little slower than with the commerical DVB-T2 receiver I had before, but CEC over HDMI works a lot better, so the TV remote worked out of the box.
I still have to get the german free IPTV channels working, but when I do I will post here again.