Thank you for this. I very much look forward to your students doing the test, and it would be good to know if it does work better right after the healings.
Doing it in class might not work too well. First, the two computers must be in separate rooms where they cannot hear each other, and secondly only one pair at a time could do it, so the others would have to wait. Of course if there are some informal activities going on and pairs could go and do it while others do something else this might indeed work well.
All best wishes for Christmas.