Ditch that Wyatt Earp 'tude!
Even if you build a superhet, somewhere on the planet will be at least one other superhet that hears stuff yours won't. Japan is loaded with hams and propagation to the rest of the world is good now. Believe me, with any JA callsign you will be a lot more in demand than a W1 operating in Florida. What really matters is to get on the air and gain operating experience.
You raise good points. The reason I want to use a homebrew station is to relive Radio the way the pioneers did it, with self-built equipment. If regens, with all their faults, were good enough for the old-timers, then they should be good enough for me. Somewhere along the way I started to get sidetracked and fascinated with the idea that I actually could build a superhet comparable to some commercial ham equipment. All a question of how much time one is willing to spend.
OK, so maybe it's time to switch gears and work on the tx side to get closer to actually getting on the air. First would be to dust off the unbuilt 2W QRP TX and companion 10W amp kits. Then I need to revive my poor-man's-spectrum-analyzer project (using a simple DC rx, strong mixer, step attenuator, manual sweep oscillator, and PC sound card spectrum analyzer) to measure spurs. Then there's the application/approval process for homebrew gear in Japan, followed by antenna construction and tune-up.
Yes, looking at that list, it does seem I need to get working on the tx side in order to enjoy this solar cycle.