Wishful thinking to make my life easier
In all seriousness a full kit would be more enticing for someone to purchase knowing that no additional research would be needed in getting the remaining parts. Also it would be easier for shops to install as well. I'm not sure what the total cost of this upgrade would be but if more people were aware of the benefits I'm sure more and more diesel owners would jump on board if marketed correctly.
I developed a product of my own for the E39 platform and it's crazy how it blew up and now available worldwide. The great thing is now I just manufacture and don't have to worry about distribution.