If the speedlites flash in a manual, one "pop" manner, then yes, the slave eye can be active and triggered from the speedlites. If the speedlites are in TTL or otherwise fire preflashes, the Einsteins will trigger too early.
Alternately, the YN622 receivers have a PC port to which you *may* be able to connect a CST, so that one TN622 is triggering a speedlite and the CST via direct connection, and the CST then relays the fire signal to the Einstein.
Alternately, the camera you are using may have a PC terminal to which you can connect the CST, and the camera triggers both the CST and YN622, each going to their respective receivers.
Alternately, you can get a pass through hot shoe adapter that has TTL pass through and a PC terminal. This would be sandwiched between the speedlite and the camera, and the CST is plugged into its PC terminal.
(I use the CST in these examples, as it is smaller and easier to mount than the CC would be. The CC would be kept on a lanyard or in a pocket.)
Alternately, you can use the CC and CSXCV receivers to control power of Einsteins, but use a YN receiver in the sync jack of the Einsteins to trigger with the rest of the YN remotes. Since you do not need the TTL functionality of the receivers for this application, YN may carry receivers that can be triggered by but not support TTL transmitters. Presumably, they would cost less than additional 622's.
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