There's a company from the UK called TOUCHTONES ( not "TouchTunes " ). They make a program from a home computer which mimicks a digital touchscreen juke. I've never tried it, but it looks pretty neat. I think you can get a free 30-day trial download from them. Just goggle it. You'll find it.
Depends on where you're located and if this is a "home use only" application or for a commercial business application. Here in the USA you'd be stuck with home use. If you did this for use in a business you'd (a) either not be able to use the technology (only certain jukebox manufacturer's authorized kits are licensed) or (b) you'd be infringing music copyrights.
This won't use a PC or provide any sort of screen, but it will get you fully digital operation using mp3 files of your choice. It's easy to install and not super expensive.