So the true benchmark on if a mission is possible I would assume is Insane difficulty. AI has less health, but you have no teammates to help you out, nothing to distract the enemies, everything exists to murder YOU, and their damage is similar to high MMR.
Long time ago I did Very Hard mode, this was before the forge existed, back when Very Hard was truly difficult. I concluded Konstantin was the best tool for the job, being tanky and high damage. Here's that video:
https://www.youtube.com/watch?v=DVFIjJsyBAI you can see that flipping the levers is not too difficult buy keeping Shae between you and Kuzmann. This was the best way to flip switches even in a team, since multiple people going for them could get shot and everyone dies due to arcs.
Important note: Dying during levers means you have to rush to them upon respawn, and that basically guaranteed Kuzmann will be shooting you before you even get to the lever spot.
NOW, Those levers take time..... I ran with 3 characters, and these are my findings.
1.
Konstantin. He was the best choice before, but now he is simply too slow. He takes an assload of damage when moving from switch to switch because the delay in flipping them. I conclude this would be an issue on all 5th council, and simply isn't going to be possible with any of them.
https://www.youtube.com/watch?v=UeUwydKbVWw 2.
Mikah. SHE DID IT, MIKAH'S THE BEEEEEEEEEEEEEST
Mikah is a recommended character for the mission. She has high health, and most importantly, the decoy. The decoy is the ONLY reason she was able to win this, it was able to keep Kuzmann's attention long enough to start levers. However, not long enough to get all 3, but upon respawn you can still juke him and use the decoy to get his attention and get the final lever. I did not use Schneider, but I suspect he's the only other character that stands as chance because his drone serves the same purpose as decoy, but can be placed from farther away. And deals a lot more damage.
https://www.youtube.com/watch?v=KDJUH_gDAR8(oh and I use Granny in case you are someone who is curious about the weapon.)
3.
Hans. I wanted to try another" recommended character" and Hans has high HP and high mobility, as well as being the cheapest character so everyone has him. Since speed was the deciding factor on Konstantin failing, maybe Hans has what it takes. Nope. You can get 2 levers, but Kuzmann will catch up, and fry Hans. Hans has no way to divert Kuzmann, and the timer is so short you don't have room for error or leading him around. Also it seemed like a lot more enemies spawned on me this time?? ALSO a sniper spawned off the map on part 1??? Speed was just not as good as diverting the walking electric chair's attention, and 140 health isn't enough to survive the shots for even 2 seconds.
https://www.youtube.com/watch?v=UJJKi-6USVMCONCLUSION: ..... the timed levers are terrible. I couldn't imagine doing this with a random team that will likely shock each other as they try to grab the levers. I can't imagine any scenario where a team could do this with an antagonist present. Please MSE take this into consideration, as the mission went from the fastest and easiest, to nearly impossible, based on my observations with multiple characters and several others posting on this forum.