Look, I'm not from the US, I'm guessing maybe the pay for tradesmen isn't as high as in Australia. But what you're suggesting as a comparison involves a pretty high degree of variance and odds are stacked against you. You need to get into a good PhD program, get funding, compete against everyone else doing those things and so on.

The path I outlined in my OP is a _very_ common path that people take in Australia and not at all unrealistic. The barrier to entry is drastically lower, and the access to funding/capital is far easier.