Orion or Kiwi Cattools for capturing router Syslogs

We've been challenged to capture syslog messages from around 800 routers.  It's a busy network and therefore we receive numerous messages.  What we really need to do is alert on particular BGP messages from the routers.  I understand that SolarWinds recommends using Kiwi Cattools for syslogging, rather than Orion.  A couple of questions I have are:

- Can Kiwi Cattools be used to capture the syslog messages, and then only send a notice to Orion if/when a condition is met;  thereby freeing Orion from the task of filtering all messages yet Orion would do any alerting necessary?

- How are others capturing syslogs or doing this?

Thanks in advance for any guidance or thoughts.