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In case both of those services are blocked in your network/ISP, it's trivial to create a Cloudflare Worker proxy to either one of them, but it's only usable for DoH. On a really restrictive network that somehow blocks Cloudflare too (you're probably better off using a VPN at that point), it's also possible to self-host AdGuard Home on a VPS to only use OISD, but it's not recommended to open Do53 to the public, only the DoH, DoT and DoQ.
Yes, looks like the code you're looking for lives in https://github.com/AhaDNS/dns-server-setup/blob/master/files/scripts/bash/unbound_update.sh