Hi André,
As it was it would fail with multiple CKEditors, but with some tweaks you can have the same for all of them.
Please refer to the OML in attachment with an example with the behavior you are aiming for.
I created a webblock WB_OnBlurCKEditor where you can pass the list of buttons you want to click, the first button will be triggered on blur of the first CK editor, the second button will be triggered on blur of the second CK editor and so on, so forth:

Hope it helps.
Regards,
João