I think that's putting the cart before the horse. With adults, strong math and language skills have been much stronger indicators of coding performance than specific training. So pin-down the basics, and you get a potentially great coder for free!

If I recall childhood correctly, they dumped BASIC/LOGO on the class, had us grind through a few cookbook recipes, and none of it was particularly inspiring. To a kid's mind, it's like, "So, I type all of this into the computer, and all I get is a stupid circle?!" Papert is a dead-end.

Fast-forward to high school--after algebra, geometry, and calculus--and the value of the computer becomes apparent.

I really liked playing with Legos when I was super young (idk maybe 5 to 12?) I feel like that primed me a bit in terms of assembling various components to achieve an end-goal. Actual computing stuff? Consider that young saplings don't have the intellectual maturity to actually grok computers until much later.

Sorry my comment doesn't help more.