Creating a foreign language on-screen keyboard for CKEditor

Question

I am using CKEditor as a rich text WYSIWYG Javascript editor.

I would like to add an on-screen keyboard so that they can easily enter text from non-English alphabets.

I was planning on finding a JavaScript on-screen keyboard and adding a custom button with a CKEditor plug-in to trigger it.

I've found a couple of JavaScript on-screen keyboards. I like the one that Google provides best. The problem is that it needs to be bound to an HTML <textarea>. As far as I can tell CKEDitor uses an iFrame and has no <textarea>. Does anyone have any ideas for how to work around this problem? Is there a way I can bind the keyboard to the CKEditor "<textarea>"? Or is there an on-screen keyboard that doesn't need to be bound to anything?

Thanks!