WOW, our Mexican Trio for 45 mins is $375! I won't get to enjoy it either as I will be taking photos, but I hope to be able to get atleast a photo with them. The trio was a splurge for us and something we used our booking bonuses on.
I totally understand not wanting to have anything in your families hands, but unfortunately some things may have to be - not saying music, but I think the bridal party and family members understand that.
Maybe just get an extra hour from the DJ then if you can, then it's the cheaper option and you don't have to worry about it.