I'm not trying to invalidate your specific use case, but in general, there's not really any practical difference between ARM64 and x86 for desktop use. ARM is generally perceived as being more power efficient, but the latest x86 mobile processors from AMD (and probably also Intel) are very efficient. The Apple M series does have very tightly coupled RAM and onboard ML & video encode accelerators, but when it comes to plain old compute power & efficiency, AMD and Intel have pretty much caught up afaik.

There were recently a couple of new NUC-type devices based on the outgoing generation AMD mobile processors. I have the Minisforum UM690, based on the Ryzen 6900HX, and it's been working great as my new desktop computer. The iGPU is pretty good too. The Ryzen 6800U (U = efficient variant, 25 W TDP) is about the same as the M2 for performance and power consumption. The 6900HX in this device is the high power variant, default TDP is 45 W but you can lower it to 25 W in the BIOS which should make it about identical to a 6800U. The newer ones with the latest gen Ryzen chips should be much more efficient.