Well you can rule out DALT straight away. Not a particularly pleasant high in my opinion, just weird. Certainly won’t help with social anxiety or enable you to better perform tasks such as ‘the phone call’.
Ethylphenidate is a horrible high in my opinion, very speedy but with a bit more warmth in its buzz than amphetamine; personally it makes me incredibly restless and unable to relax. May well give you the confidence you’re looking for but take too much and your jaw will be going like MDMA, not so great for a phone conversation.
AMT, in small doses, say 15mg-ish will give you quite a pleasant mdma style buzz and alertness. Probably your best option of the 3 but be aware of its long duration. Plus take any more than about 30mg and most people start to feel its psychedelic effects.
