Looks like this been implemented in LEM version 6.3 currently available as an RC:
"LEM monitoring through NPM and the Orion Web Console
You can configure SNMP version 3 on your LEM appliance to communicate with SolarWinds Network Performance Manager (NPM) through ports 161 and 162. This configuration allows you to monitor CPU, memory, and other critical components from the SolarWinds Orion Web Console.
Other improvements
- Disk warning feature that alerts you when your disk storage reaches 75% capacity
- CMC appliance menu updates to assist with SSO configuration
- Upgrade to Java® 8 for improved security"