Hi,
On this case VPN client does not have posture assessments functionality, since CSD or HostScan would not interoperate with VPN client IPSec, and that was a way to block connections based on OS/AV/MAC address and so on, however VPN client has basic functions using DAP.
If you want to set up a deplyment like that, you will need to move to AnyConnect Secure Mobility Client, like that all the Hostscan along wth DAP will work blocking or allowing based on your policies.
Let me know if you have another questions!
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David Castro,
Regards