Here are some tests of the backlighting idea (which I can also do for the back). I forgot to add the text to these before rendering, but I can do that in just a few clicks for the final render:
Option 1: Direct ray emission
Option 2: Indirect only ray emission
The latter seems to have a stronger, but less "harsh" blue light.
Again, these are test renders and are at a much lower quality than the final images.