Here's what I've came up with so far for the filter/nDepth to monitor connects/disconnects from VPN per ASA which will not include the L2L connections:
...and for the rule to notify when a user has connected successfully to the VPN:
I'm sure this will be expanded in the future, but for now, this will get me what I need. I'll just set this up at each site that wants to monitor for VPN connections from vendors and then modify the IP. The 'UserModifyPrivileges.EventInfo' also displays the Group Policy assigned to the connection along with the user. So, you could even narrow it down by vendor, assuming you've setup a group policy per vendor, which I would assume you would. Hopefully this helps someone else!