I'm not too familiar with DNS updates, but am I understanding it correctly that 
it would be setup like so:

I set up two different DNS servers, one public and one private. I delegate 
int.example.com to the public server in our global DNS. The private server will 
serve the actual subdomain records, and will send DNS updates to the public 
server. (in order to respond to ACME challenges?)

Where can I find info on how to set up the TSIG keys and DNS updating on both 
ends?

I have seen these, but do they cover everything? Because I still don't know 
where to start.
https://doc.powerdns.com/authoritative/dnsupdate.html
https://doc.powerdns.com/authoritative/tsig.html
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