Well, this is something that can be done. One good thing about NT is that once you learn what is normal, it will apply to many sittuations.
Lets put some examples:
If you get close to an atracctive girl that is used to reject many guys a day and starts a conversation, that girl may think that you are sexually attracted to her and the conversation is not what you really want.
If you get close to a person in the street who has to reject many sellers or poor people asking for money, that person may think that you will also want money and not conversate.
If you are walking your dog and you start talking to a person who has dogs, they may think you want your dog to socialice with theirs.
If you start talking with the mother/father of a friend of your child they may think you want to discuss something about the kids.
If you start talking with a person at an anime/manga convention they may think you want to have a casual chat about anime/manga and wont suspect hidden agendas. Thats why freaky events are great to meet people in a cassual way, the hidden agenda here is exactly to meet people who share that hobbie.
So people will think that your hidden agenda is similar to the agendas of other people they face in simmilar circunstances and who have a simmilar gender/look/behavour of you. (The gender/look/body language part is important too)
So take that to your advantage.
Not sure if what I say was too obvious of gave some value. Feedback is welcome.