Never mind, I booked the following additional run for this Sunday:
LX-2987 SWISS Basel Zurich 10:40 / 26JAN 11:20 / 26JAN Economy
LX-1058 SWISS Zurich Hamburg 15:45 / 26JAN 17:20 / 26JAN Economy
LX-1061 SWISS Hamburg Zurich 19:55 / 26JAN 21:25 / 26JAN Economy
LX-2990 SWISS Zurich Basel 22:05 / 26JAN 22:40 / 26JAN Economy
Cost was CHF 169.50 for 3000 Club miles and 5000 Bonus miles (if I counted right...)