And try and ignore all the stuff people say about not trying to fit them into an idea of normality.
Supporting someone to communicate effectively for their employ,ent isn't the same as trying to change them as a person.
One of the things we do with my ds is teach him about reading then the conversation initiator has finished the conversation they've initiated before turning it round to his interests.
So for example someone will ask him a question. If it's if a topic he's not interested in or he couldn't give a shit either way what they decide he'll give a half arsed recognition they've spoken to him and then begin his conversation at with them about his interest.
We've taught him that he may not feel what they are saying is of any interest or consequence to him but the fact they are asking him means they need an answer or want his input.
And that he has to make some effort to engage in others conversations if he wants them to engage in his.
We've also spent a lot of time looking at conversations and the difference between opinion and fact. And how people will take facts and statistics to present their own opinion to you. And - again - how then respect of differing opinions has to go both ways.
We have used a lot of conversation cue cards.
So for example if you want them to get Joan to give information he can relate to you then give something to make sure that information is recorded - Eg a printed sheet where they need to record the information. And if you want to prevent them disappearing for 60 minutes on a 6 minute request give a clear deadline of timescale.
It's more about supporting the skills required to prove they can do the job. The other stuff (such as monologues people will have to get use to and to be fair they'll probably be a group of professionals in another part of the room avoiding them for reasons of their personality - that's human nature).
The biggest thing my ds has struggled to get over and I'm still struggling with is that when someone asks him what he's doing he won't just answer - he'll go into a long explanation about why. It's because he's automatic response to being questioned is to think he's doing something wrong. So another thing you can help with is reassuring your employee what they are doing is right when they are doing it right.
Perhaps if they need to ask people like Joan questions you can encourage it to be done via email? Then they can't go off on a tangent?! I've learnt to text my ds when I just need a 1 word answer 😉🤣🤣