The so called elevator glitch isnt a glitch at all. Raids that dont require summoning will re-spawn or heal if alive when you die. Your just using an elevator to cause your demise. Not a glitch.
Maybe Saturn, he drops the invader and Hive, the latter being more more appealing to myself, anyway. He also drops either heads or skins, not sure. HOWEVER, must warn you that he loves dropping 48's, like all the time. BNK-3R can be farmed if you walk out into thousand cuts and right back in; he will respawn without requiring you to quit.
If your feeling sadistic, you could farm Tumbaa for a Deliverance. No joke, while running through the preserve yesterday to kill SoM, I saw Tumbaa for the first time EVER in the game, and he dropped a Royal Deliverance. Life is cool sometimes. xD
What is a man?! A miserable little pile of secrets!