> But I'm still interested if you know of a concise efficient alternative, which would allow reading & writing.

We already showed you:

$hash{$_} = { %$value } for @keys;

or

$hash{$_} = { %value } for @keys;

The only concise alternative which comes to mind is

@hash{ @keys } = map { { %value } } @keys

But it's neither shorter nor easier to read.

Cheers Rolf

update

But honestly you should stick to syntax you understand, even if it takes some lines more.

In reply to Re^9: Combinations of lists, etc by LanX
in thread Combinations of lists to a hash by tel2

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