I am trying to find out if we are allowed to clone a PDB in to an new Container(remote host when licensed only for the Single tenant architecture? Would be great if someone can share some pointers.
as long as there is only one PDB in each CDB involved, you are fine. So you can do a remote cloning of your PDB into your new empty CDB.
Please see https://docs.oracle.com/en/database/oracle/oracle-database/19/multi/cloning-a-pdb.html#GUID-2512C9E9-FD11-4F33-871B-892ED5FC4079 for more information on the procedure and do not forget to change your display name as described on https://community.oracle.com/welcome.