The only broken part of the bike was the rim. There is a shop in Istanbul that services Rohloff hubs, so we were hopefully they would also be able to source a rim. Unfortunately, this wasn't possible, they had no rims in stock (or suitable spokes).
We ordered a Ryde Andra 30 rim and spokes from SJS Cycles to Istanbul -- as it would take at least a week, we decided to stay in Gaziantep and also visit nearby Sanliurfa by bus.
Food of Gaziantep:
Aubergine and lamb kebab, with ayran and salad -- delicious
An incredible museum with a lot to see. I paid attention in the first half, but then rushed through the rest as I found it hard to concentrate for so long.