Nice to see someone using VDJ like this, I personally did this for about a year and a half (though never for any gigs) before I got my first controller. I found it really helpful to map out my keyboard like the buttons on a controller and eventually got it to be almost like a controller just without the jog wheels! This ended up being helpful. Although since you have a controller, you could just pick up Serato DJ Intro for free.
I realize your gig has already passed, just hoping this could be good for future reference!