Possible to make a traffic adaptor for MKIV?
 

I know EAS was working on this for a bit when the 46 was still for sale, but it seems as though they've dropped the project.

Would it be possible for someone to make an adaptor for a source of traffic info (e.g. sirius) and convert it to the TMC info that the MKIV can understand?

Anything is possible with the right info and experience and effort

But your request is very very complex....