High capacity small portable audio player

Not sure where to post this, but I am looking for a small-sized portable audio player. The ideal requirements: small size, high capacity (can be through microSD, ideally up to 64GB), supports HE-AAC v2/eAAC+.

It is unfortunate that there is literally nothing on the market as smartphone took over.

iPod nano: meets the size and HE-AAC requirement, but stuck at 16GB

Sandisk, Cowon: don't support HE-AAC

My last option seems to be an Android phone, like the Xperia E: smaller than most Android phones but still big compared to the iPod nano, microSD but maxed at 32GB, supports HE-AAC.

Any other ideas?