Any sort of character penalty that causes more time lost than glyph-swapping will discourage play of these awesome missions.
Personally, all that argument does is make me want to remove glyph-swapping.....
Alright, I generally try to avoid restating my opinion, but let me put it like this.
Losing at worst 15 minutes of my time means nothing to me.
Losing a few resources that will quickly spawn elsewhere means nothing to me.
Losing the mission means nothing to me (I mean if we take battleground as an example I purposefully lose those so that something worthwhile will spawn)
If you remove the risk of death I probably won't play these missions. They will be boring rather than tense. If my reaction to failure is "meh" and searching for the next one then all the fun of them has been sucked out. For the record this is also the reason that I don't switch characters before trying them.
The problem I have, I think, is that changing it will only effect people who like these missions anyway, if you can't do the missions removing the risk isn't going to make you play it, you will continue to avoid them, at best you might try two instead of one before giving them up as too hard. And If you are choosing to do a mission that threatens instant death then that is a choice you made and you should accept the risks associated with it.
...the more I think about it the more farcical it sounds....we are removing death arbitrarily for two missions, if the Illari can save me from these why can't they do it at other times? Are we going to change the death message to "The Illari decided not to save you this time, shame you weren't being chased by lava....."
Now having finished being snarky, obviously I don't expect this to have changed anyone's mind as clearly we have different mindsets, my reaction would be to remove the ability to avoid the risk not simply remove the risk.
And it doesn't even have to be through limiting transfers, if the death of a character actually made a difference to your settlement that would be something, as it stands you have your main character and then a nigh infinite number of sacrificial pawns whose deaths mean nothing. Which is I suppose a separate issue.