While it's not ideal, you could add the photo on both devices. When I take a photo on my phone, it shows up on my iPad (I'm talking about the built-in Photos app here, not the DVD Profiler app). And even if you don't have that configured, you should still be able to Air Drop the photo to your other device. You would just need to add the profile image on both the phone and tablet.
With that said, if the PC version is an option for you, that's by far the best way to maintain your collection. But if it's not an option (no PC, you have a Mac, etc), the above solution should get the job done.