Gadi, have you looked at the BCPii interface from OPS/MVS?
You can go directly with rest api's to HMC from OPS/MVS, once you've setup OPSBCPII.
We monitor all lpar's states that way as HWS api events will show up in OPSLOG and can be automated (email/ticket..)
I'd advise to setup at least one instance of OPSBCPII per CPC as obviously you'll miss events if the owing lpar is in trouble.