I have the same problem lots of people do, the raised lettering of the insignia has fallen off.
For my 2009 Cayman a solution recently presented itself.
PLEASE be aware that this hasn't been an easy fix, nor is it a perfect fix. BUT in my opinion is better than just the glue hanging in there with letter like broken teeth in between,
I am attaching a link to my personal blog post describing the tries and failures I experienced, please be gentle!
The sign shop I used was Jet Blast Designs in Vernal Utah. The owner is Aeryk Hurley 435 823 1890. I have no financial connection to him, it was just a question of me being in the right place at the right time.
He has no knowledge of RV's and no other connection to the Monaco insignia other than where I asked for his skillful help.
Click this link to go to the blog post