The free Veeam utility Business View
can help you do this
With Business View (BV), you can set custom attributes on VMs (or Hosts) in vCenter. You can build rules in BV on how the attributes are set - one rule could be "set this attribute for all VMs in this Resource Pool".
And the nworks MP will recognise certain attributes and bring them into SCOM as properties of the VM.
Then you can use these attributes to populate a Group in SCOM, such as "VM Dev servers".
Then create the overrides to disable nworks Monitors for that group.
The group will be automatically maintained, because when you add a VM to the Resource Pool (or Folder) in vCenter, BV will set the attribute, and so the VM will automatically join the SCOM group.
There is an Appendix in our MP Operations Guide on how to set up BV - MP integration.
You can download Business View from veeam.com, at no charge!
Hope that helps - any questions let us know!