C414EBs are a whole class up from any of the C12 replicas, in my opinion. So stepping down and sourcing replica capsules for your C414s strikes me as an inferior solution.
I would even consider replacing your old first-generation Teflon capsules with the improved TLII/ C12VR capsules before I would envision aftermarket products.
Tim Campbell is probably the most serious about hunting after the original CK12 sound, if you really want to go the aftermarket route; but while I am familiar with his reskinning efforts, I do not know what his complete CK12 copy capsules, which feature his own backplates, sound like.
P.S.: Keep in mind that will need to source a CK12 mount if you want to go the route of buying an original CK12 or copy, because the Teflon capsule's mount is an integral part of the capsule itself.