I am pretty sure this has been covered... But I just want it directly stated pure and simple....
Using kemper -> SPDIF out -> Audio Interface -> USB -> DAW
This is a COMPLETE digital chain with no analog to digital conversion AD/DA correct? Am I also correct in assuming, the "quality" of the audio interface, does not matter 1 bit as the signal is digital? Is there any reason for me to not use the absolute cheapest audio interface I can buy that supports SPDIF? Of course, there are going to be various features and things different interfaces may offer, but, if my only goal is to get kemper -> daw, why would I need anything more than the minimum/cheapest option?