Quick printing on-location?

I need a method for quick & easy printing at events — step-n-repeat portraits 4x6" guests.

For years we've used Canon's outdated ImageBrowser EX. And it's still a viable option, but it hasn't been supported for a while.

What do you recommend? We need something that allows us to select multiple images and print one 4x6 each. The images don't need edits — just printing. I only wish Bridge had a print option!

I usually star the best shot for a couple in-camera and then filter out those (in Bridge) once copied to the laptop. It's just me -- no assistant.