This will make things so much easier.

Here, certbot runs in Docker in the intranet, and on a VPS I have a custom-built nameserver to which all the _acme-challenge are redirected to via NS records.

The system in the intranet starts certbot, makes it pass it the token-domain-pair from letsencrypt, it then sends those pairs to the nameserver which then attaches the token to a TXT record for that domain, so that the DNS reply can send this to letsencrypt when they request it.

All that will be gone and I thank you for that! You add as much value to the internet as Wikipedia or OpenStreetMap.