Your wife might have a trusted app on her phone and tablet; but others might want to be careful with that idea:
Forbes Magazine: Android Malware Hiding In Bible Apps
As for carrying a Bible ... with the baggage rules on airlines these days, many of us have to minimize.
Also I like the idea of the Gideon Bibles being there -- not so much for people like you and me, but for non-religious people who might be going through some tough or lonely moments in their hotel rooms, and have never thought of looking at a Bible before.
There are safe ways to buy apps. One is to ask people who have already done so.
You are against the changing trends and technology. Ret assured the Gideons and others will still be ministering to prisons. Just don’t have a fit when you open the drawers at the hotel and no bible. Thing of the past.