You'll only be able to do that if you have some way of swapping discs without pressing eject, such as a slide-card or flip-top case replacement. Plus it only really works with CD Based games, not DVDs, unless you do extra swaps with CDLoader.
From memory, the process is that you load up AR2v2 as normal, then choose to 'start game without codes activated', then use your swap method to swap out the AR2v2 for your CD based game (or CDLoader if you're going to boot DVDs) then press X.
If you've just put a CD game in, then it'll load (so long as the game size (TOC) is under 74 minutes)
If you've chosen CDLoader, then it'll load.
You now need to press eject, change the disc with either Swap Magic or a large sized (TOC) original DVD based game to refresh the TOC, press X to load its initial boot sequence up, then at the 'EA Method' screen that appears next, you use your swap method to swap the disc with your DVD backup & press X.
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