I appreciate the replies guys. I guess I was already on the best approach using the slice.
The link to "values" and it's helpful to know that they be operated on directly. I tried it
map s.(\d+).$1+1/e,values %nums;
which worked great. Love it. Helpful & useful. TYVM
If I'm reading that right, it does appear from that link that as an experiment, perhaps keys also worked that way for some brief Perl versions:
use 5.012; # so keys/values/each work on arrays
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