Any reason you're avoiding the Raspberry Pi or other arm based SBC's? You will lose some performance, but most of them are more than capable of running a node and bisq and lightning. No you're not going to have the raw performance oh what year looking at now, but they are inexpensive and they do work.
-Dave
I've seen people mention ARM TrustZone pose some similarity with Intel Management Engine, where they have concern it could weaken security or even used as backdoor.