Handedness really only applies to the task to which it is applied, and only scantly to new activities simply due to existence of neural pathways. This is relatively new science, as a greater proportion of folks TYPE for more of their life than they handwrite - so we’re seeing a shift in hand-dominance (neural pathway establishment) as generations become more naturally ambidextrous because of keyboards and phones in out lives.
Eye dominance, however, is effectively a permanent neural pathway which never changes unless the dominant eye is damaged or otherwise degrades. Studies in neuroplasticity do reflect we can “fight nature” temporarily, but the transition takes time and is never sustaining when the unnatural obstacle (cough, cough, tape over shooting glasses, cough, cough) is removed. Your brain will ALWAYS want to use that favored eye, and will come back to it when trucks and traps are removed.
Ultimately, you can teach a left hand all of the tricks it needs to manipulate a trigger. But you really can’t retrain your brain to rely upon the wrong eye. Maybe that’s the best way to describe it, neurologically - there is no “wrong hand,” whereas there IS a “wrong eye”.
Of course, as marksmen, we should practice all of the tricks and traps to be capable of shooting effectively with either hand and either eye, but these aren’t our standard mode of marksmanship.
A bolt action carbine with a 16-20” Sporter weight barrel in a lightweight chassis compatible with a Luth-AR MBA-3 dual adjusting carbine stock and threaded for a linear compensator would make a fantastic youth rifle.
Another one to consider, the Manners Compact Stock.... not designed as a youth stock, but short enough to be so, and able to grow with the youth into full adulthood. With a Remage set up and using a Manners Mini-Chassis, it can all be assembled without a smith.