Would it not be easier to add that line than a custom import function?
That assumes that you know all the functions exported by all the sub-modules before designing the All.pm module. The OP specifically contradicted this assumption: "their export list is not fixed and changes from time to time".
So, ::All needs to be designed in such a way that if ::Two v2.00 exports just twoFunction() , but ::Two v2.01 exports frobnicate() as well, ::All can still work without having to be updated.
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