Any x86 will be so low powered due to design constraints such as power and passive cooling that it would be comparable to a much older “typical” laptop. Just buy reconditioned Thinkpad if you need compatibility - it’ll be much cheaper. Those interesting OS we run on our Reforms (Sculpt, 9Front) also run on Thinkpad models, and if you can make do with boring old linux it’ll run on anything you can find.
It is not like anyone is proposing to carry around a quiver of compute modules of different architectures and change them in the field according to need, which might have been a valid argument for x86 modules over just having a secondary computer.
Production seemingly already struggles to keep pace with demand, so that is not the problem.