Yes, it seems to be the best way to do it like it is done in Victoria. At the moment I'm taking a closer look to the CR2 File of her to understand the composition and the connections in the file. 
I noticed that there are files like "InjDeltas.EyeDepth.pz2" that contain the delta data of the morph (?). I would be very pleased if the adjustment of my eyes can be done by just scaling and moving, cause my eyes have a different geometry than Victorias, of course. 

Above of this I try your suggestion of code in your posting and get back with the result as soon as possible. :)