Just brand his ass instead
But seriously, I think the people that are pointing out that a boy isn't going to view a lavalier the same as a girl, are speaking truth.
Girls can propose to boys, usually girls don't propose on bended kneee with the offer of an engagement ring. Or at least not that I have heard.
Would your chapter do a candlepass for you? Is that kind of what you are angling for? Thats cool but maybe they would just do one for you anyway.
The original poster also said her BF isn't in a fraternity.