I think the quicker the game makes players realize they are safe from immediate ceremorphosis the better. This needs to be addressed ASAP, far earlier than meeting Halsin and other 'gurus'. I am talking about something like the first dream sequence here, during the first long rest.
Disagree ...
This urge to find healer as possible works well for the story ... if you would inform a player trough dream sequence, that would ruin it. :-/
I would dare to say it is well established, when you are running around Nautiloid ...
When you push the button (or pull the lever, or mind the console to proceed, or however this illithid nonsence is working) ... Lae'zel coments that turning by this means should be impossible ... that alone establish that normal rules dont apply to you, but its subtle enough for people to overhear.
BUT!
It wouldnt be bad, if she would also mention that you need to hurry, bcs by today evening, your mind and personality will allready be consumed and replaced.
(If i remember corectly, victim of ceremorphosis personality is erased in +/- 3 hours ... so, our very first long rest > would be long too late for us.)
You know, leave some crumbs there, but allow people to ignore them.