Ched Evans took over up front for the hard-working Vokes after 62 minutes, while defender LewinNyatanga was sacrificed as David Cotterill beefed up Wales' attacking options.
Germany began to seize complete control and the home side need a superb last-ditch lunge by LewinNyatanga to stop Kuranyi from doubling the lead on 23 minutes.
Dexter Blackstock, who was making his first start following a year out with a serious knee injury, also blazed a shot over in the closing stages while LewinNyatanga also fired over the bar.