I was considering this idea as well, but was concerned about the total cost and if it would be available when I arrive in Mexico.
Here's a little more food for thought.... you can order mini somberos (Oriental Trading) and tie/glue it to the top of the bottle. It'll resemble a little man and add a little more Mexican flare.
BTW, I love Patron Silver!! Great tequila, but it's not for everyone. All of your guests may not enjoy it.