Thanks for your input! Those from AbuseMark look great. The USB-C version works if DisplayPort Alternate Mode is supported. It costs 30 USD, same as regular DisplayPort one.
I have an AbuseMark board as well, despite not having used it yet as I don't have the right display connector the service was excellent and can vouch for them too. I had a cheap chinese board first which didn't support brightness control, but the AbuseMark boards support brightness control over serial so that's nice.