Hello @PJ_Glasso , the information you provided is very helpful.
Regarding your 3rd point, do you know how I can find an NVMe what supports PCIe x2 mode, maybe a M-key only ones?
Does the NVMe have to be Gen3 or a Gen4 NVMe would also work in this case? (the B-key slot is PCIe 3.0 x2)
If I can find it then maybe I can use it with the B+M to M-Key adapter.
So far I found this combination: