For those who would like to experiment, this Anybus OPC server does have a simulator built-in and AHMI can communicate with it by using its OPC driver (MatrikonOPC explorer can also access it).
The attached picture shows how to set the Data Source to the simulator.
You can create your own groups & tags but, to get you started, I have attached a csv file which can be imported to have the tags look exactly as the attached picture.
I couldn't figure it out but there doesn't seem to be a built-in support for arrays (even though the column "Data type" does allow you to choose one).
If anybody does figure it out then post it here.