I prefer the kiss solution :-)

Package Cfg::Hash;
$Cfg::Hash::HoH={ A => 1 };
1;
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and in the main code:

use Cfg::Hash; # provided it can be found
warn $Cfg::Hash::HoH->{A};
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So, just fully qualify your hashes, and it is very easy to find where they are defined. (and strict will not complain).
ps: this is similar to the our approach.
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Dr. Mark Ceulemans
Senior Consultant
BMC, Belgium