Datura ferox would work to potentiate a LSA/LSH experience, yes - just like any other member of the Datura, Brugmansia and the related families. I am, however, not aware of the amount of Hyoscyamine versus Scopolamine and Atropine in this plant. I can find some articles, but no one available for free. Maybe someone can help out here?
Daturas tend to have high concentration of Hyoscyamine and medium to low concentrations of Scopolamine, but there are exceptions - like Datura inoxia. As you have noted, Hyoscyamine is what you want, as it is not sedating as Scopolamine, is better to combat nausea and seems to alter the experience significantly better.
It is, however, not true that Scopolamine would alter the experience to the worse, it will in a minimum decrease any anxiety. 69ron has stated that he has not noticed any enhancement of effects with Datura inoxia, but in my experience, this is not true - I have used Datura inoxia seeds together with Psilocybe mushrooms with success. Datura stramonium are a significantly better alternative, that is true without any doubt, but I believe any member of these families can be used.