Backup alarm/beeper wanted

I love my Metris, I also am concerned about backing it up. There are three of us, my family, running our vending business. I recently purchased the NAV-TV backup camera kit to add a backup view on the factory media box, but I would like to make it clear that the van is backing up. I know that the backup alarm is loud, and obnoxious. If there is anyone who disconnected their backup alarm/beeper and would be willing to sell/donate to our budding business. My eighteen year old son is the primary driver and I want to give them a fighting chance to avoid any backup issues. I would just go buy the part, but the **** thing is spendy. Consider it a recycling thing…Thanks