This is probably the most challenging of the Buster upgrades :)
In the past we just took an outage for the time needed for the reimage (namely stopping hive/oozie and some functionalities of Druid/Superset/etc..) so may do the same this time as well, but we could try to test our procedure for the failover of all services, including the Meta database:
https://wikitech.wikimedia.org/wiki/Analytics/Systems/Cluster/Mysql_Meta#Failover (but replacing the db1108 bits with an-coord1002)
We can proceed with an-coord1002's upgrade first, preserving data on partitions (except root), and then quickly test it via a rapid hive failover. Then we could move all the Analytics Meta clients to 1002, as well as hive/presto/etc.., and finally reimage it.