Is there a "supported" way in RHEL/CentOS 7 to union-mount a directory tree on top of an NFS mount point?

I have an NFS share containing some hundreds of chrooted (s)ftp user's home directories.

This NFS share is mounted on several FTP servers forming a highly available FTP cluster.

I would like to enable syslog logging on all the cluster nodes at the same time.

To do this, I need a dev/log socket in each user's home directory, and it seems that I need it to be different for each node.

Currently, only the node where the syslog daemon was first started perform any logging. I presume that is because the dev/log socket is in use when the other nodes try to connect to it with socket(2) or listen(2) or something like that.

So, I planned on creating an overlay directory structure on local disk on each server, containing just directories and the dev/log sockets.

Problem is, I'm on CentoOS 7, and aufs is not available.

Q: Is there a way I can have a separate /dev/log for each user directory (the sshd internal-sftp and vsftpd do their own chroot:ing) on each server? If so, can I do it without making a mount --bind for each user account, which would be my last resort?

(Specifying the path to the log socket in vsftpd and sshd would be an elegant solution, since I tell rsyslog where to listen and can easily change that).