RISC-V is, among other things, a single shining ray of hope that we might actually be able to build a truly secure computing platform from the ground up instead of the backdoor-riddled stacks we have today.
Assuming that USA, Russia, and China are not hidden allies then we might be able to buy risc-v manufactured chips from other countries to prevent domestic spy agencies from accessing private data, but then there is no guarantee that USA, Russia, and China are not allies. Perhaps they share data with each other at similar capabilities to Five Eyes.
At the worst case we got some open source chip design that will constantly evolve. Perhaps we might be able to print such CPU chips at home but that is decades away.
Tbh you'd have a hard time since either you're trying to measure a few milliwatts in a very noisy environment (either very low wattage, so various effects dominate, or high wattage, where your equipment will quickly get very very expensive).