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The adapter bushings remind me of the use of some like them that were made to use in oil burner engines to keep them from fouling. It can make them run hotter depending on the design of the threaded bushing. If the design was such that the plug tip was well positioned in the combustion chamber then it wouldn't run any hotter than the plug design allows. Done correctly, it would be an option for those that want to modify the T engine and use a more modern ignition system.
For those that like the T the way it is then don't bother to fix what ain't broken. Trembler coils worked well on low compression engines of the era. At least replacement plugs are still available.