In light of Easy Debian dying due to glibc no longer supporting the old Maemo kernel, I just tried to run the basic Alpine armhf rootfs in a chroot under Maemo.
At first sight the chroot seemed to work fine so I assume that musl doesn't put the same restrictions on the kernel version like glibc.

In the process of that test I stumbled upon PostMarketOS, which according to Wikipedia is based on Alpine.
So I'm going to assume that PMOS should also run in a chroot on Maemo. This could enable us to keep the essential Maemo features (telephony, power saving) while benefiting from whatever PMOS has to offer (minus accelerated graphics).

Has anyone tried that or is planning to?