How much does DL care about nested ticketing?

I have a ticket YVR-CDG RT on AF metal (booked thru DL with GUCs applied). I'd like to wrap this with SEA-YVR RT on DL. No bags, shouldn't have any requirement to thru-check or interline in either direction.

I'm not circumventing any back-to-back or end-on-end restrictions as far as I know. I could also book the positioning segments as oneways if that makes any difference.