Yep, you can do those areas before going to Ust Natha without any problems. I alway did it that way, because in my first run-through I went to Ust Natha first, and then I got stuck in the Illithid City. It took me a long time (in-game time at least) to get out, and the spell from Adalon that made my party look like Drow had worn off, so that I couldn't complete the quests anymore. Of course, if you know what to do it'll be no problem to finish all three areas within the required time, but doing them beforehand made me feel less rushed.
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