The point about real-time systems is not the your tolerance of 'blips' its about analysis of your worst-case timing requirements. This is what real-time control systems are all about.

Sure, you may be able to tolerate a 1 second 'blip'... how about ten seconds? a minute? do you know for sure how long Linux may put your process on hold for? Linux provides no guarantees at all.

It seems to me that what you are really creating is a traditional control system with web technologies and using the hype-of-the-day (i.e. edge computing) to justify it... with the corresponding increase in overhead and cycles.

This does not seem like a good solution to me, the only novelty here is the inappropriate use of technologies. i.e. you've managed to dig a tunnel with a spoon.