Looking at the SAVV website I do not see a Comforts seat head rest fitted with a screen. The invision looks great, shame about the comfort seats headrest.
I fear that the only way to keep the fully functioning comfort seats headrests is going to be a highly customized job which would be way too costly to justify...
This place in London is supposed to be teh best, they have one picture on their website but that screen looks small...For a nice set up they charge £3500...Just for 2 screens and DVD changer. The alternative is the BMW Advanced system but it doesn't look great and seems bulky.

C