Too bad someone didn't buy Nye-Viking, when the owner passed away. He made good products and he sold metal bases for his oval and rectangular bases. With the increase of new Morse interest, maybe some retired fellow would being them out again, and maybe even make the semi-automatic keys that Nye had the rights to make and continue the old Johnson straight keys and bugs.
Here is a fellow that is selling the original bakelite base for a J-38.
There are other sellers on eBay that sell bases for the flameproof key.
73
DR