I figured it out, you need to make an item then reroll it at the mystic once to something else. Then bring it back to the save editor and make it a gem, at the same time changing the old and new affix in the mystic tab to what you want let's say 10-20%atk speed. At this point it doesn't matter what the 6 main affixes say, they won't be on the gem anyway. I tested it and it works. Movement speed doesn't stack sadly, was looking forward to having 600% movement speed. Guess it only works with fixed legendary affixes:)
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