There’s also the more recent Alta and Solitude from Libre. They seem to be supported in recent CoreElecs nightlies.

But yeah, information on those is also a bit thin.

I agree, but - at least to my understanding - that’s not what OP was looking for…

Maybe a LePotato ? No first hand experience, but it seems to be able to do 4k

Bundeshaushalt.de vom BMF selbst scheint schon ziemlich genau zu sein, was du suchst:

https://www.bundeshaushalt.de/DE/Bundeshaushalt-digital/bundeshaushalt-digital.html