This idea of using drugs to make her less of a typical Vulcan to promote any romance smacks of bad writing and lack of creativity.
Reading this, I immediately thought of Spock and
This Side of Paradise, which I thought was well-told and poignant storytelling. But IMHO, I don't think the goal in either case was to promote romance; I think it was to force each Vulcan's suppressed emotions to the surface and explore the ramifications of that, and romance was one of the consequences.
I always had Sarek and Amanda in the back of my mind when I watched Trip and T'Pol. Something had to ignite that relationship too...some spark that got Sarek to thinking that this young, illogical, wildly emotional human was (of all things!) bondmate material. Just as with Trip and T'Pol, there may have been initial friction, even dislike; personality clashes; miscommunication, though Sarek's ambassadorial training may have lessened that possibility

; awkward signals of affection from one to the other, out of sync, as each struggled with the other's cultural differences.
But how did Sarek come to develop affection for her? Somehow I don't think it was simply "the logical thing to do," as he joked in that episode. Maybe it was
pon farr, maybe it was some lowering of his emotional barriers in private with her because he sensed a kindred soul and wanted to explore the possibilities. As T'Les said, Vulcans are sensitive to emotions, even if they may not express them.