Hi Steven,
instead of the t in "Öckertpöck, Eggertpöck, and similar variations", more likely it would be an s like in the two variants I saw (Ekherspökh here and Öckerspöckh in the marriage record).
If you'd like those other spelling variations to be checked for s/t, just post some of your links here.
As for the similar sound, s/t clearly makes much more of a difference than ck/gg or e/ö. ;-)