My youngest has been a successful switch hitter since little league, until we ran into a few travel coaches who discouraged switch hitting, even after proving he could successfully hit from both sides in a few games - we'll see what the fall brings with a new travel coach. He can also hit golf balls from both sides. Vision is normal without glasses, hand eye coordination rated as exceptional from a hitting coach. Strong hands and wrists.
Extra hitting work will only be successfully if his swing is trained properly and mechanically sound. Bad swings x2 can take tens of thousands of good swings to correct. Train the swing!