How to add Digital input to RDS-D? Is it possible?

[SyncroS8]

Hi,

I asked a while ago if my S8 (2001 FL) has a TV and the overall consensus was that it doesn't due to missing the TV Tuner in the boot. Even if I added the tuner box, I'd only get 'snow' due to lack of a TV analogue signal now.

Nollywood mentioned that I might be able to add a Digital input to the RNS-D... is this possible?

If so how and what would I need?

Cheers

MG