Pecon, I have an idea that might fix a lot of problems with Kaje: Instead of dropping the player into the mech, turn the player into the mech, and spawn a random bot as the driver. It would fix both the fact that Kaje can't be damaged because apparently the vehicle isn't part of the minigame or something, and the possibility of a dumb player ejecting themselves from the mech. (Though admittedly that second scenario is pretty funny.) To top it all off, the damage done to the boss would be shown onscreen. It would also look exactly the same to the players.
However, we haven't really used Kaje without an invincible mech. It may require a new datablock with higher or lower health for balance.