I think from the 2 acrylic plate, you need to change 1, to switch between them, so Its possible, but I didnt think about that. @alauder should know, it, I'll ask him.
Hi an_Age and Dice. Yes to switch from D5 to DDC you would have to switch the rear plate plate and pump mount but not the front plate. Dice would have to sell them as separate parts. It would require you to disassemble the distributor.