trythis3 Since the location is already built up with these devices for these apps, and the money and time are already comitted, I thought if I had the apps sandboxed, then at least Id have some advantage. And, all other apps could be treated normally by GOS to get its full privacy advantage over them.
I don't think I understand.
GrapheneOS doesn't "sandbox" apps in a way that is fundamentally different from Google's Pixel OS. There are some additional features beyond the standard Android application sandbox, such as contact scopes and storage scopes, but it's not clear those are relevant to these two apps.
What GrapheneOS does "sandbox" that Google's OS doesn't is Google Play. "Sandboxed Google Play" does not mean "Google Play except that the apps using it are specially restricted so they don't leak information to the app authors". What "sandboxed Google Play" means is that Google Play itself is not a privileged system application.
If you are concerned about limiting what the Adobe and Eufy apps can do, putting them (and Google Play) in a secondary user profile could help to some extent... but that inherently conflicts with getting full notification support on the lock screen, because apps in a secondary profile don't have complete access to the lock screen, and because if Play is in a secondary profile that isn't authorized to run in the background then the notifications won't even arrive in a timely fashion.
Overall, it's not clear to me exactly what you are trying to achieve. It might help if you could say what information you are happy to share with those two apps, what information you would like to withhold from those apps, and what else you are hoping to protect from what.