I haven't heard form Dana for a while and, according to his homenode, he was last here 3 months ago.
Have you tried emailing him at the address shown at https://metacpan.org/author/DANAJ ?

Other than that, if you tell us exactly what you wish to change about Math::Prime::Util::sieve_range(), someone here might be able to provide you with the required changes to XS.xs (and any other affected files).

Update: According to the Math::Prime::Util github repo Dana's latest commit was made less than a month ago, so I think there's a good chance that he's still active and contactable.

Cheers,
Rob