Originally Posted by
mikeyfly
Getting the transit to C and staying on will bring you back to landside without much time or effort. However, you will no longer be "ready to fly" so I'd suggest whizzing up to departures and getting that ironed out before leaving the airport - it's not much of a faff to be fair
It's not something I would recommend unless there is really no alternative. Among other problems you may lose your seat reservation, and if RTF is having a bad day it can get problematic.
For the OP, I would go landside anyway, particularly if they are from an e-gate country, since it may well be the fastest / easiest way back to airside. If they don't show up then you can work more pleasantly in Regus or the Sofitel or Carluccios.