Please please no cash shop! I don't care what I have to do ingame to get it as long as it's not a cash shop exclusive.

I could definitely see this as being a new drop for t5 or t13. There are still(bafflingly) many people who haven't made it past t5 yet and a big reason for it is the lack of experienced players going into those fights. Just like with the relic grind and such bringing many experienced and well geared players back into lowbie dungeons this could revive t5 and get new players or those who just can't get past it for whatever reason their clears so they can get into more active coil tiers.