Seems you managed to save up enough and get the card.
I saw your video on Youtube and it pushed me to buy yet another RME device. I went with the HDSPe MADI. I already have a Fireface UFX+ and wanted to connect the two devices together via MADI. It seems to work out well. Finally a lot of channels on GNU/Linux, not limited by USB class compliant mode anymore. Very nice.
Now if there was TotalMix FX, that would make it perfect. In the meantime, I'll try to befriend HDSPMixer.
UFX+, M-1610 Pro, ADI-2 Pro FS R BE, HDSPe MADI, PRO Z690-A DDR4, i3-12100, Debian GNU/Linux, Ardour