I don't think there is to be honest.
I would enquire at your local kart centres about any junior championships they run (if at all). That will at least give a competative environment to learn the basics for a year or 2 and give ample time for you and him to work out if it's something you want to pursue.
Failing that, i'm not sure how much it would be to pick up a 2nd hand cadet (someone will be along to fill in my blanks) for use at test days etc. But that's a cheap enough way to get bum-in-seat time. You just need storage and some mechanical skills.
Peat
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