Originally Posted by
Spiff
Fly out to non-Schengen, fly back in? Mileage run.
Actually you may not even need to fly out. Buy refundable ticket out of Schengen, clear immigration out of Schengen, "change" your mind, clear immigration back into Schengen, refund ticket.
Many years ago after arriving in FRA long haul, completely forgot to claim checked baggage and realized right before I got on a regional train. Went back thru immigration out of Schengen, then back into Schengen to access baggage claim for my flight.
I've been stamped by Italy 100% (all arrival by air) but they, along with France, do stamp on random pages and orientation. The Germans and Swiss align their stamps not just along with the borders but also ensure entry/exit are adjacent with one and other.