Corey,
Your post got me thinking as I have a BTH fitted to my Shadow that I bought used off of evil bay. The new BTHs are CDI units mounted externally. CDIs have been used for years on bikes made by other manufacturers and they are all mounted inside the engine covers. I suspect that they are therefore operating at temperatures that are slightly higher than the BTHs mounted on Vincents are. Looking at the coils that come with the BTHs and those that are advertised as replacements for various other makes, there does not appear to be much difference. This leads me to believe that the components inside the housing would not be to markedly different to what is in use on other machines. Having said that I wouldn't be surprised to find the internal components adapted from already existing production to reduce development cost. I think therefore the operating temps our BTHs are experiencing are within their capabilities. But all this is just conjecture on my part.
In fact Electrex World
https://www.electrexworld.co.uk/ markets CDI components for BSA and Triumph singles. I have often wondered if I could take those components and adapt them to my Comet's primary without changing the appearance of the primary cover or make a suitable BTH like housing that would fit under the mag cover.
Steven