The procedures can be called within the body of other procedures.
But I don't think you can achieve what you are trying to do by nesting the SYSEXECSQL calls. The procedure expects a SQL in the parameter and executes it. Though there are some limitations to the operations that can be performed in the dynamic SQL, like you can't execute SELECT statement etc., which I believe you are already aware of.
CALL is a PL/SQL statement and it won't be supported in as the parameter of SYSEXECSQL!
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