First of all thanks a lot for solving my problem.

But I was wondering if there is an expression that would avoid having a two-step solution (i.e. without first assigning a temporary $glob variable).

So is there an expression that when I have a symbol ("hubba" say) I could do a

$some_convoluted_expression{hubba}->{CODE}
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(or something like that) to determine whether or not there is a sub-routine of that name in the main-package.

But this is for bonus-points only...