So, I think I have good news for those of us who have transitional J pens with broken cap jewels.
I expect to have a quantity of the 2nd generation cap jewels available by the Chicago Pen Show. The toaster tops are simply way out of reach to manufacture, but the screw-on domed cap jewel is a feasible project. I will be selling these, and likely up on my Esty shop site. So, it's better than staring at a busted top, or wondering how to restore the caps we have without any jewel at all.