Sorry to hear abut your problem, I hope you heal well and soon.
My sons and I have owned at least 6 of the NEFs and I still own one, a Handi Rifle with several barrels. I modified the youth stocks for them. It sounds like you hand load, a 94 Win with 135 gr bullets a shortened stock and recoil pad might not be a bad idea if you can't find a youth stock for the CZ. There are also reduced recoil loads in the manuals and available commercially. The Browning Lever Rifle with a saddle stock is another option. Chambered in 243 Win or 260 Remington would be a great rifle. Simply replace the butt stock after he gets too big to extend it as he grows. The only problem I have with a straight stock (saddle stock) is the recoil comes straight back and is not deflected by the drop of the pistol grip. More felt recoil.
