You should not use cake pop makers to make Takoyaki. They don't produce the same texture. Cake pop makers are designed for batter that rises so it's okay to fill up only the bottom half as the cake will rise to fill the rest of the mold. Takoyaki batter has no leavening agent so they wont fill out the mold so you basically can only make half a Takoyaki at a time. Takoyaki makers are a different story.

Ebelskiver pans are also a poor choice. The lips/sides aren't high enough for making Takoyaki and folks will make a mess. Takoyaki-ki pans have higher lips because they are meant to be over filled as you use the the picks to mash up the cooked batter to move them to the molds to create the sphere. Anyone who has seen or made Takoyaki before knows what I'm talking about.

I'm not sure why you are recommending Ebelskiver pans when you can easily find Takoyaki pans on Amazon for as little as 13 dollars. This is a pretty good one for 20 dollars and has guides in the iron for easy pick guidance: https://www.amazon.com/IWATANI-TAKOYAKI-Grill-cooking-CB-P-TAF/dp/B0098HKKL0