Sorry to hear about the troubles with your CPU/mobo pairing. With how quickly you’ll be plotting, I think you’ll quickly outgrow the native SATA on your motherboard regardless of which route you take so I wouldn’t stress too much about that. Jumping up to 11th gen to get PCI 4 makes sense to me, and I am increasingly jealous of the ASUS Hyper card crew on this forum…
Looking forward to seeing what this rig does for you once you have the last few wrinkles sorted out!