Data center folder sync problem

My actual config is a little more complicated, but for the sake of keeping this question simple I am going to minimize it.

I have a bigip ltm unit in datacenterA and a bigip ltm unit in datacenterB. The datacenters are connected with a point to point so a trust relationship can ( and has) been established between the units. The datacenters do not have the same network infrastructure so a sync-failover group is not what I am after.

I just want the irules to be kept in sync from one unit to the other.

I read through the manuals and found mention of a device service cluster, using a device group (sync-only) and segregating the objects that I want into a folder under the partition the VIPs and pools are located on. YES, exactly what I wanted.

The confusion comes in when I tried to set the device group of the folder. Since my configs are all in /Common partiton and my folder is /Common/stuff-to-sync the F5 will not allow me to set the device group of my folder.

If I make a new partition and set the device group it works BUT all my VIPs in the /Common folder cannot reference objects outside of the /Common partition.

All I want to do is sync my Irule changes between A and B while the rest of the config on the unit is specific to that datacenter.