Unreal 5.8 - Control Rig Runtime Asset vs Control Rig Asset

In Unreal 5.8, when you create a control rig, eg. by right-clicking on a skeletal mesh and selecting create>control rig, it now creates a "control rig runtime asset " rather than a “control rig Blueprint” asset as it did in 5.6.
On the surface it looks pretty much the same but “control rig runtime assets” don’t seem to appear in the dropdown list for a control rig variable, making it seemingly impossible to assign in OnInitialUpdate in an animation Blueprint.

Is there a way to create a “Control Rig Blueprint” asset as per 5.6?

Alternatively, is there a way to ‘convert’ a “Control Rig Runtime Asset” into a “Control Rig Blueprint” asset?

Alternatively, is there a way to convert a “Control Rig Runtime Asset” reference into a “Control Rig” reference in blueprint?