I think that if I were you, I would add an equation object, then use VBA to examine the object (Find out its type, properties, etc.).
You can write a routine that will work with that which is currently selected, then select the equation object and call your routine. Out a breakpoint into the routine. When the VBA editor gets the focus, and the code is halted on the breakpoint, you can start examining the object.
If you
Code:
Dim obj As Object
Set obj = Selection.CurrentSelection ' (or whatever the proper property is)
then you can highlihgt 'obj', right-click on that highlighting, and select 'Add to Watch Window' from the context popup.
I suspect this is going to take some research...