Romance is dead in this Forum. I think it's a great idea. However I think you need to get some more ideas.
Take if from someone who has been married more than 25 years.
The others all talk about value and divorce.
I think it shows a PERMANENT commitment.
It shows you will never stray ( I mean really, who arms someone, teaches then to use it, then cheats on them), and that you trust them with your life.
Just don't do anything corny on it. Like "I aim to love you" or "you are my main squeeze "
Good luck, congratulations, and remember "she is always right".!!