Here's the idea: Add a new item to Gracken's inventory in Emberlight. I'd call it the Deep Supply Pack.
Here are the specifics of how it works: First off, much like Vitapods, each knight can only carry one at a time, and it is lost if they leave the current expedition. If the knight carries the pack all the way to the Core, they can talk with one of the NPCs there to exchange it for a bounty of Radiant Fire Crystals (that bind on acquisition).
Possible numbers: The pack could cost 5,000 crowns and award different amounts of crystals depending on the selected difficulty — 18 on Normal, 27 on Advanced and 36 on Elite.
I personally think that the decision to relegate Radiant Fire Crystal acquisition to the deepest depths of the Clockworks would have been a brilliant move if it had been balanced properly. My idea here seeks to resolve this issue.
Much support for this idea, I have a something to add maybe you could choose a "larger" pack that costs you double and gives double the amount of rads the normal one gives but in exchange it reduces your movement speed by 1 level (should look like something you carry on your back like crystals)