Yeah, I'm not looking forward to it lol. It's like implementing TCP on top of UDP. I'm all ears if you have any advice or lessons learned from it though :)

I was intending on starting from scratch, but if there's an open source or available one we can heavily customize, that would work too. It looks like CoreDNS offers customize options, just not sure if it's to the degree we need or not yet

Definitely want to avoid things looking anomalous. What do you mean by an existing solution?