Here's what I've got so far.  This is just a rough draft to see what your thoughts are.

http://i.imgur.com/xb0DI0K.png

I'm having trouble seeing how that sun-bird thing will integrate into this style.  It could work on the certificate, where the circle is, but that engraving style takes MUCH work.
Here are some examples of that engraving style that I've done.  It's not the type of work I do on spec though.  I'd have to have a guarantee to spend the time on it.

http://i.imgur.com/NxV05Ib.jpg
http://i.imgur.com/Ac3baI0.png

Let me know if you're interested in seeing more.