Hi
Yes the Anchor is in the DMZ, also CPPM has a leg in the DMZ so connectivity wise a Cisco user could reach the CPPM guest portal.
The Cisco WLC is running y 7.5.102.0 on the anchors and a much later version on the non anchors.
I have not tried setting this up without the Anchor but i can try and test today.
If there are any design guides around that would be great.