Hash slicing will surely do the job. But what I'm talking about is a single line normal assignment, like what I am sure I did in the past. Just like we do with individual symbols,

*alias = *target;

# so we have $alias = $target, @alias = @target
# %alias = %target and so on
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but we can do it package-wise.

Assigning the symbol table hash itself doesn't help either (because it clobbers the table)

You are right, shmem. I really forget how I did what I'm trying to say, but I really did. So, until I find my old code, I will consider that it can't be done, and stick with the for loop or hash slicing as shmem shown for this particular task.