So here I wanted to suggest a budget friendly solution and explain why I think it is the best.
Personaly i believe that the best solution here is not mention it at all ...
Yes, the tadpole have plot armor ...
The only reason your grop is holding together is that they all need each other, remove that and they will send you to hell faster than Gale did in his campfire scene. :-/
Therefore the only logical way to use this "method" would be either as instant game over (or lone wolf) conversation trap ... wich would be diabolical, but oddly satisfying.
If you talk about it, no matter what reasons you create there will allway be ome nitpicking nerd, who will claim that "this is not corect" ...
If you dont, there is at least small chance that some people will not even think about it as option ...
To me honestly it makes sence, no matter how "respected" Halsin is among his own people, he is still a stranger to you, aswell as litteraly anyone else you meet during first act ... so if you would thrust anyone to "purposely kill you and promis he will bring you back afterwards" ... it just dont feels right to me, sory. :-/
The fact that you (or any of your companions) can die during the fight (where its not really matter of choice, but consequences) and it dont help you with your brainbug problem at all, while when they (and any other tadpoled character) is PERMA killed, they allways get out ... shows in subtle way that this option is not aplicable for you ... wich should be enough in my honest opinion.
