NeoDialectic
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Thanks for the shoutout. My post provides the basic skeleton of what to do, but @LateStarter did a fantastic job outlining the things you need to do for this specific application. It sounds like he even solved many of your problems by suggesting how you could bypass certification (using already certified parts). Don't overcomplicate things. Do the absolute minimal neccesary to build a decent prototype and start testing the market. You will figure out how to make it look super professional and cutting down on costs after you've confirmed there is an actual market for your idea.I know nothing about electrical engineering or what it would take to accomplish your idea, but @NeoDialectic has a fantastic post on the Idea Testing phase: Link.
Everything in there might not be valid for your use case, but the post (and the thread itself) how to test ideas quickly & dedicating the right type/amount of resources for testing.