There's nothing wrong with my old PC case, except I'd like some USB-Cs in the front panel.
The panel itself is unfortunately integrated, but it's possible to get additional front panels to 3.5" and 5.25" slots (the ones traditionally used for CDs etc). Here's one example from akasa with at least one USB-C: https://akasa.co.uk/search.php?seed=AK-ICR-36
It's perfectly fine if I have to just disconnect the integrated USB-A ports due to lack of motherboard connectors. They suck anyway.
So, please share recommendations for such devices. Let's not let those old cases go to waste!
After some research, the akasa seems to be as good as it gets today. I did find one Graugear with identical ports: https://graugear.de/en/portfolio-item/g-mp01/
All the ones with more USB-Cs seem to achieve this by splitting the 20G connector into multiple slower ones, which is not worth it IMO.