Windows EOS utility have wifi remote app, that whenever you take photo allows you to transfer each photo taken to a directory in the pc via wifi router.
Problem is, you need a windows image viewer that display the latest photo on that directory. (I don't know if there is such software) - you can try settings in EOS utility to allow display photo that was just transferred.
Another good option.
Buy Toshiba FlashAir sd card. If you have android table. The Flash Air app will display latest photo taken each time, transfer time is about 30sec. Your problem now is, how to connect projector to the android tablet.