How to connect vCO workflow to Multi-Machine Blueprint Actions menu?

Using vCAC 6.0.1, and vCO 5.5.1

I need to extend the Actions menu for Multi-Machine Services (deployed from Multi-Machine blueprints).

I have used Advanced Services to extend the Actions menu for VMs, but I can't find a matching VCAC, or VCACCAFE type for Multi-Machine Blueprints.  (They show up as catalog resources in the vCO inventory, but that appears to me to be a generic type that would catch things other than the Multi-Machine Blueprints.)

Is there a type that could be used to create a Custom Resource for Multi-Machine Blueprints?

I have been able to do what I want using the machine menu stubs in vCAC Designer (aka CDK, aka Advanced Designer aka Design Center).  However, this is limited to the 6 state change workflows and 4 stubs without the license.  I am trying to avoid purchasing a CDK license for the sole purpose of adding a dozen menu items..

Is there another way to approach this?

DC