It should give a second market for selling unused tickets... Don't know when it's start... A think short after the second ballot... U can't sell it outside the UEFA website...
Stay in Berlin and travel with ICE train to Munich and Cologne @ matchday and back the day after. To Stuttgart take flights from 22nd til 24th with Eurowings airline...
Sell 2 tickets directly next to each other
West Stand
Turnstile12 - 14... Area Section A6
for 55 Pounds together.
Payment via PayPal only, e-tickets sending by email immediately...