well, the bit about the forest being healthy again could either be referring to Faldorn's death or the shade lord's death. maybe you could put drenden in the umar hills/shade imnesvale map, saying he fled Faldorn's ascension since he knew she would kill him. then, you don't have to include anything with trademeet or the druid quest and it wouldn't really change anything with the ranger stronghold quest. alternately, you could put him in north forest or one of the other pretty much unused areas from chapter six and just have him be traveling somewhere. he can have his home there for the time and jaheira knows where to find him