I should explain two things:
(a) My wife and I know precisely which trains we plan to take for our trip.
(b) When we travel overseas we like to have both belt and braces. So in the past we have always had both of our tickets on each of our phones and also have had printed copies.
Will this work as a plan for our trip which involve seven days of travel.
Some time before we travel we will activate our passes and put each of our own tickets onto our respective passes.
We will then take screenshots of each of our tickets which we will then ensure are put on BOTH of our phones.
We will also have make printouts of the screenshots of the tickets.
Then as security against something going wrong and having to change our plans, we will deactivate the passes, and we will then reactivate them much closer to the time of travel and this time input the tickets for real.
Peter