Dissolve on existing material?

Hello there
I'm using a great toon asset that gives my artwork a wonderful handdrawn look.
I want to dissolve the toon look and reveal a textured version of the same object.
Basically so it looks like it's being "brought to life".
The dissolve shaders seems to have its own material - how can I make it work with the material I'm using already?

I first thought of using having one with the toon material and another copy of the same object but with the textured version.
Then having the dissolve working on the first and turning on the second (that has been hidden until then)

Would that be a way to do it?
Any direction would be much appreciated.

 

Either:
1. Swap materials in runtime;
Or:
2. Implement your own dissolve in the shader.