Yes, with Timeriffic you can simply uninstall.
However, there are other apps that will prevent uninstallation unless you have a password. Most of them are classified under parental control. I don't use them, but there's a lot of them to search through for both Android and Ipad. What you'd want to do is have a friend or relative set up the program to block the internet and tell them not to give you the password so you can't undo it.
Also I think there's parental control built into the newest version of the Android. Yeah, see
this link. So again, you could have a friend/relative setup the administrator profile, give yourself a regular profile with blocked internet apps, and then simply have them not give you the password to the administrator account. No internet.
So you have to jump through some hoops, but you could do it. I'm sure you could do it with an Ipad too.
If you are set on an E-ink screen, you might want to wait a bit. Early next year an Android tablet with an E-ink screen is supposed to come out. See
this link. To soon to tell if it will be any good.