Done! Works like a charm!
(actually, it was pi-hole that brought me here!)
I followed this to set this up, though if I would have just poked around in the pi-hole admin menu the local DNS was all I needed. You can just do an nslookup to verify scribes.log.roku.com is returning 127.0.0.1.
https://gist.github.com/netsensei/7c71b3215bbf440746151aafc4cfd84f
@phantom321 - I realize you posted this almost a year ago. But THANKS for taking the time to run WireShark on the packets.