Nuremberg is c1 Hour by Train, Ingolstadt is en route, Regensberg a bit further. When I did it c8 years ago the Cheaper Option was to buy a Bayernkart than a Return etc. There may be late Trains on that Line.That’s what I’m doing. The only problem is the last train is just before midnight, and with a half hour journey to the station it will be tight, and if it’s extra time and penalties it will be a €150-€200 taxi.