BigFix Client Upgrade - Patch Policy

There doesn’t seem to be a way create a Patch Policy with External Content that includes BigFix Agent upgrade fixlets across all OS. If there is, can someone please share how?

Only selecting Windows from the drop down gives options for “OS Application Updates” and “3rd Party Updates”, but then the “Upgrade” category for the BES Client upgrade fixlets is not in the dropdown.

I want to create a policy where BES Client upgrade fixlets across all OS are included in a patch policy. Cloning the fixlets to custom content is not ideal.