I would love to see a "Sysmon Content Pack" from the SIEM. The method you described above is a great way to get Sysmon logs into the SIEM. I wanted to get these types of logs into the SIEM as well but without any additional software installation - ie NX Log.
My solution was to write a small PowerShell script which scraped the Sysmon Event logs and outputted them in a custom format for which I wrote a custom parser for. This took a lot of work but gave me a lot of control over exactly what I wanted to log and in what format.
Ideally there would be a way for the SIEM to natively collect these logs like it does the security and application logs.