The visualizations built from the customizer is ultimately a group of text files. If you manually lower the version number in the specs it *MIGHT* work, if there are no reserved keywords. It might work without lowering the version number. Give it a try?
The language behind it, visJSON is a little on the esoteric side. Given enough time it's not that difficult. You define the expected data sets, the outline of the visualization, and the basic shapes inside it.
It would help if the person using the customizer has previous experience with graphing languages, such as D3.
Finally, if the focus is on fancy and advanced visualizations, I would strongly recommend upgrading to 10.2.2. There are several enhancements to RAVE, the biggest is the properties.