I must be missing something. You mentioned dropping a partition, so is there an actual need for the delete? Could you detach concurrently and then drop the table or delete rows if needed?
https://www.postgresql.org/docs/14/sql-altertable.html#SQL-ALTERTABLE-DETACH-PARTITION
https://www.postgresql.org/docs/14/sql-altertable.html#SQL-ALTERTABLE-DETACH-PARTITION
