All I can add is that on Al'Kabor (the EQMac server), I was down the hallway around the corner against the wall just far enough away from him not to aggro and I could still do the trade. If I was too close he would aggro. So I slowly moved closer towards him while clicking on him with the bottle until the trade window appeared (non-invis/invis-undead). You have to change the camera view to do this.
My apologies if this doesn't work on P99.
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