Recovering a bad cluster fails with charm actions

[Diko Parvanov]

Trying to run rejoin-cluster or join-cluster charm actions fail with getting authentication issues on the unit I tried to add, I had to manually recover that unit with the following commands:

STOP GROUP_REPLICATION \W;
SET GLOBAL super_read_only = 0;
CLONE INSTANCE FROM 'clusteruser'@'<ANY_WORKING_MEMBER>':3306 IDENTIFIED BY 'CLUSTER_PASSWORD' REQUIRE SSL;

Then in mysqlsh on the master:

shell.connect('clusteruser:PWD@MASTER_IP')
cluster = dba.get_cluster()
cluster.add_instance('clusteruser:PWD@<INSTANCE_TO_BE_ADDED_IP>')

Is it possible to add this functionality to the charm?