> only the musl little/big-endian variant would be of interest to the G5
> and the majority of 'our' PPC machines. ppc64le is >=POWER8.

Little-endian musl is also ppc64le and thus requires POWER8 or later. The only variant running on 'our' machines is the big-endian musl one, and requiring 64-bit it only runs on PowerMac G5 (and would run on Cyrus / AmigaOne X5000 if its packages weren't compiled for AltiVec/VMX). The majority of 'our' machines is 32-bit so Void Linux for PPC64 is void for them ;-)