Sure buying mod calibrators to sell is a plausible idea but I feel like there needs to be a bigger sink for these coins.
Lockdown Costumes
As I've seen the idea floating around a few times before, why not introduce the Lockdown Class' equipment as costumes that can be bought from Sullivan?
They could all copy the themes of the bombheads - Starry / Iron / Shocking / Scary etc.
Flags being the obvious.
Recon packs general colour / style could be different.
Striker boosters' jets could be different colours based on the variant. (Obviously just the stream behind the jet as you move)
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Here's a quick picture of the basic types of flag.
Azure / Emerald / Golden / Onyx / Ruby / Silver. (Colours taken from parts of the bombheads).
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Rare Bombheads
The rarer bombheads (not acquirable from Sullivan) could be purchased with extortionate amounts of Krogmo Coins / crafted with mats + energy + coins.
E.g Fiery Bombhead = 25 Blaze Peppers + 500CE + 1000 Krogmo Coins (Obviously haven't thought the idea through on costs, just clarifying that it wouldn't be an easy feat so those who won theirs through working as a team in Lockdown wouldn't feel cheated)
Far too often teams are unbalanced making it even more frustrating when the prizes are bombheads.
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Obviously these are just initial ideas so if you shoot them down or think differently about it I won't be disheartened haha.
Nice idea so far :D We need other things to buy with krogmo coins.
I have about 1000 Krogmo coins already. But there is none that could I buy. :(