Afaic, AUFS[3] is now big with many _cool_(?) feature like the new XATTR inclusion. So, don't hold your breath because PaX (or hardened patches on Gentoo Linux) is also a monster (patch size). If you are a Gentoo User and feel like to take a little adventure, you can take an ebuild from Gentoo ovelay (tokiclover/bar-overlay/blob/master/sys-kernel/git-sources on github) and adapt it for kernel tarball (easy to do because it will otherwise pull a full linux-stable tree--almost 1GB by now, well ~800MB to be fair,--) and try to pull hardened & aufs USE flags... Patching will surely fails... that's where that little adventure of yours will start. Good luck.
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