I just wish there were an Alpine variant with native glibc support.
It would hardly be Alpine, and it would be much bigger, its very hard to make a small glibc.
A great deal of the cruft in modern distros comes from docs, example configs, etc -- things Alpine does a great job of cutting out. Obviously a glibc variant is going to have a much larger memory footprint, and (arguably) is less secure than an musl libc distro, but it gains the ability to run glibc-only software (cough Oracle Java cough) without having to ship around container/host images with all the extra junk deb packages bring along for the ride.
I may be misunderstanding the problem but wouldn't it be possible to package up the bare minimum for running the JRE?
The glibc runtime required files is about 4MB total (uncompressed): libc, libm, libdl, ld.so (the runtime linker), libnss*, libcrypt, libidn, libpthread, librt, libresolv, and a few others.
The gcc runtime files by comparison are 12MB total (uncompressed): libstdc++ (7MB), libgcc_s (0.5MB), libasan (optional; 4.5MB).