Text form fill display or monogram preview window

I have a client that is looking for this feature. This is a sample of the web site.
http://www.craftcuts.com/connected-letters.html?font=Almibar&height=4%20inch&approx._thickness=1%2F4%20inch

I’m trying to see if the is a module, plug-in, or script that makes this possible. If anyone has an idea it would be greatly appreciated if you let me know.

Thanks