I would like to see them add a Golden crate which has a low chance, maybe a 1% chance to replace a green or red crate. It will have a 100% chance of dropping an Orb.
This one change would make orb grinding MUCH easier. Effectively since orbs drop at a already low rate, its effectively doubling your odds of getting one.
why not a epik crate
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I think that it'd be easier to just have a way to downcraft orbs (probably at a 1-1 ratio or maybe 2-1 and you can't go back). That'd mean that to advance to the next star level, you still need to play in your current level but it also makes it easier to get new gear up to your current level.
I get that the idea is that higher level players have to play in lower levels (+ help newer players) to get the right orbs, but once you get 5* stuff T1 and T2 are practically unable to kill you, so it becomes incredibly boring to play through them. Plus if the newer players only get through some of the more difficult levels because of a 5* player destroying everything in their wake it's not like they're getting much better at the game.
But GH might not decide to do that, and I'd be OK with a new level of crate. Maybe you could also have Danger Missions give you a guaranteed golden crate at the end of the mission?
Howhever, on the other hand, one of these purely for orbs feels quite... Empty. Maybe they could also have an ( Smaller, PLEASE ) chance to drop an spark of life.
Honestly I would prefer for such a box to drop a big bunch of heat crystals (maybe 6-12) per box in addition to an orb, considering I also struggled to collect enough heat crystals when i was playing with 4* gear.
Down-crafting orbs does sound like a pretty good idea as well, perhaps up-crafting as well would also be good but both with some loss as well to make it somewhat better.
On a more serious note, such a box that is guaranteed to contain one orb means practically nothing if the box itself has a rare chance to spawn. A 1% chance to get a 100% chance of getting something is almost exactly the same as having a 1% chance to get the thing in the first place; you may as well just give a flat buff to the orb drop rate instead of adding a new box for it.
Offering it at the end of a Danger Mission may as well just be the mission reward.
However, if such a crate had multiple possible drops (such as other rarities, as mentioned above) and/or could potentially be a guaranteed spawn in some locations (such as one golden crate after a danger room), then it may have a purpose.
Personally, I would like to see a Falminar Crate.