Indeed, very interesting information, thanks for the provision.
The therapeutic role of 5-HT1A and 5-HT2A receptors in depression
Among the drugs that are 5-HT2A antagonists include trazodone, mirtazapine, and nefazodone. It's unfortunate that mirtazapine has higher incidences of cardiac side effects (even compared to other antidepressants): Cardiovascular Considerations in Antidepressant Therapy: An Evidence-Based Review
If you reach out to Peat about serotonin antagonists at some point please ask his opinion on ketotifen as replacement for cypro. It would be very interesting hear his opinion and if ketotifen can replace cypro then we would have at least one serotonin antagonist with no known serious side effects.