If such a beast existed, and they don't, it would be so complicated it would cost way more than it's worth. The issue being that a VCR doesn't have a single head like a cassette player, those adapters were cheap and easy back in the day.
I would suggest you pull the unit out and see if there is any type of auxiliary inputs at the back. That way you could just play from a dvd player and input directly into the tv or into the VCR.