It's all question of economics, rather than that of engineering.
I've put together a number of diesel
CDS rigs....when they had a measure of popularity and similarity to existing gasoline setups.
However, there are differences in the kit makeup and the time put into developing the requisite brackets, driveline adapter, power transmission components and unique speed control systems.
If however, each model year transition and make of vehicle combined with the requisite number to sell is not even break even, it becomes prohibitive cost-wise. It makes no sense to "tool-up" for the option.
Manufacturers of
CDS systems have "dabbled" with diesel install packages, when it looked like it made sense, and then withdrew when it didn't.