The DSM Guide lists QA team validated versions that we have tested and are known to pass review and validation. This does not indicate that the DSM does not work for a product that lists older version information. In Support, we typically tell users to complete the integration as described in the DSM Configuration Guide and open a case for any Official DSMs that do not parse events as expected.
The DSM Guide outlines the tested standard. You could open an Integration Request for Enhancement to request something like a DSM for Solar Windows Orion Log Viewer (which as a Syslog forward functionality) based on the documentation. However, I'm not sure if this has the capability you are explicitly asking about: https://documentation.solarwinds.com/en/success_center/orionplatform/content/lm/lm-log-forwarding.htm.
If the Solarwinds Log Viewer sends Syslog and includes the data you are interested in, you should be able to use the DSM Editor to create a custom log source type for your events.
QRadar RFEs FAQ: https://www.ibm.com/support/pages/qradar-request-enhancements-rfe-and-how-use-them
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