I tried to find the console command to start this script. but I didn't find it in the http://www.gamesas.com/topic/19-ultimate-faq-answer-post/ here or on UESP. I see no other option to finish the question than to use these console lines.
Spoiler
player->Journal, MG_Sabotage 100
player->removeitem misc_fakesoulgem 1
player->removeitem misc_fakesoulgem 1
Of all times I've been played Morrowind for the last 8-9 years this quest script only worked a few times with and without mods, so mods doesn't have anything to do with this except for a few times.
Is there anyone here who know the exact command line via Morrowind console for this quest script for Galbedir?