How to setup SSL before changing NS ?

[Once]

To use autossl panel required to change NS.
But domain already in use on another server, and i'd like to complete setup and than change NS to avoid downtime.
How did u solve it ?

[Starburst]

SSL requires the domain name to resolve to the server IP.

Best option is to set the A record TTL to 5 mins. move the site, and create the SSL.