I found someone from opensuse started to maintain grsec patches for 4.9 kernel series [1]. Maybe it will be possible to add linux-lts-grsec package to AUR based on Daniel's PKGBUILD and config with RANDSTRUCT enabled linked to new upstream source.
[1] https://github.com/kdave/grsecurity-patches/tree/master/wip \-- Sent using MsgSafe.io's Free Plan Private, encrypted, online communication For everyone. https://www.msgsafe.io
