inwx-zonefile-sync

• Create zones directory
• Copy or create zone files in the zones directory
• Copy inwx/conf.cfg to conf.cfg and edit live section to match your account
• Run python3 sync.py
• Done.

Keep in mind that NS records on the root of the zone are completely ignored (making it easy to copy over old files), for SOA records only the RNAME gets updated, and INWXs restrictions are in place (e.g. minimum ttl of 300 seconds).