(Dont forget that right now you only get 2 more ... in this case you would get 2 more in EVERY turn ... and while curent situation is that they are focused on Illithid ... nobody said they would be.
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Yes ... possibly ... if there would still be XP reward.
I think the removal of experience would be the best way to solve the problem if the helm fight is indeed a problem - I have seen the Mind Flayer cast Mind Blast 6 times in a row, and the average slap has been ~20 damage. If two additional Cambions joined each wave;
Lock them into the tunnel by using chairs/unconscious bodies/chests, at the entrance
Maintain Cambion cluster density using Void Bulbs and explosive force from fire/Caustic Brine/jet fuel if they escape (they shouldn't be able to with a good barricade).
Create enough of a gap where the only option for the Mind Flayer AI to connect an attack is by using Mind Blast (forced spell cycle).
The total amount of usable space would quickly diminish with +2 Cambions per wave, and it would in fact be easier to contain within AoE parameters with knowledge of the AI. The total number of Cambions capable of surrounding the Mind Flayer looks like 7, which you can shrink to 1 by positioning the Mind Flayer against a wall behind a chair or table. The nooks underneath the raised platforms come to mind. If Cambions continued to rush while the PCs remained in hiding, the only other AI target would be the Mind Flayer.
Another option I could see is a scripted Mind Blast/Stun, after which the Mind Flayer runs to connect the transponder itself. Even that can be avoided if you destroy the Mind Flayer before it reaches the console. This one would be the most realistic option if EXP is not removed. After X amount of turns, no cutscenes, no additional models engaged, nothing out of bounds added, scripted Mind Blast and bolt.
I think Larian would have to remove EXP values completely to make the fight not worth it, and that's not a rewarding experience for those of us that want to revel in every encounter within our alignments. In this game where replayability is a massive part of full story completion, adding another dynamic allows for more variety in gameplay.
The climactic event at the helm should be GLORIOUS! by all means as a culmination of learned technics in the tutorial.
BTW:
Since first scroll you ever find in this game is Fire bolt ... what else would you like to have?
A physical damage PC - I have yet been capable of completing the fight with a barbarian PC - I just get smacked around like nobody's business and the survivability chances shrink
I do enjoy that aspect of wizard though, so many scrolls available to learn early so I don't feel confined to my limited starter spells. I tend to find just over 100 gold in the tutorial which is enough for 2 of the awesome scrolls in the tutorial! I generalized spell caster by reducing to Wizard class - I think the Warlocks and Sorcerers have the option to start Chill Touch/ Protection from Evil and Good too.