I don't know what you're worried about.

1-3 seeds of Datura stramonium seeds are completely safe. 3 super large super potent Datura stramonium seeds can have up to only 210 micrograms of hyoscyamine. The safe maximum adult dose of hyoscyamine is 1500 micrograms. You would need 21 super large 10 mg seeds that are super potent (0.7% alkaloids) to equal that much hyoscyamine. With an average size 7.7 mg average potency seed (0.3% alkaloids), you would need 64 seeds to reach that dose. So 1-3 seeds are nothing dangerous at all.

Dramamine works but is a very crappy thing to add to a psychedelic. SWIM doesn’t like it one bit. It really muddies up the effects.

Scopolamine hasn’t been tried by SWIM yet. It should be just as effective as 1-3 Datura stramonium seeds, however it’s a sedative and might not be as nice. Datura stramonium contains mostly hyoscyamine which is a stimulant in small doses. It did not muddy up the effects one bit, and in fact made them a little nicer.