Hi devil, just to let you know, I installed Arch on the x230 (5.7.2-zen1-1-zen) and wireguard works fine so I think its something amiss in the 5.5.9 siduction kernels onward. I installed siduction-patience-nox-amd64-latest on another partition, upgraded and then tried to install wireguard but the meta-package wanted to pull in an RT kernel and headers. I had tried with the RT kernel previously so didnt bother and just installed wireguard-tools but still got the same error as I posted above '/dev/fd/63:5:1-99: Error: Could not process rule: No such file or directory'.
Which I think may be related to permissions though that's just a guess
Ive tried 4 different 5.6+ kernels now on this machine and they all work except the Siduction ones