The trip really isn't that bad though.
Clay is Flo's best surface, so it's understandable he wants to stay on it. Plus he is lacking form and presumably confidence. When that is the case, it's normal for players to play a Challenger.
Where it make sense to stay on clay if he will play the next 4 weeks on Grass!? No sense. I talked to a physio from Benni Becker two days ago and no one can understand this decision. Davis Cup tie against Australia will be on Clay but in Sept. and not in June or July...Olympics also on Grass and not on Clay.
And trip from Projestov to Halle is not that good. You have to move to Prague, then fly to Germany and from Dortmund or Hannover travel to Halle...