Seems you managed to save up enough and get the card.
I saw your video on Youtube[1] 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.
Thank you!
[1] https://youtube.com/watch?v=jK8XmVoK9WM
UFX+, M-1610 Pro, ADI-2 Pro FS R BE, HDSPe MADI, PRO Z690-A DDR4, i3-12100, Debian GNU/Linux, Ardour