This is a Snap Pea Sheep recipe.
Japanese eggplants are long and slender. I do not believe they are GMO like the globe eggplants. (I find it impossible to find organic Japanese eggplants). I suppose regular globe eggplants could be sliced into quarters lengthwise but they wouldn't be shaped like a bratwurst.
This sounds like a lot going on but the eggplant and onions can cook at the same time. Most of the clock time is in the marinade.
The cooking time depends on the eggplant, your grill method and the temperature of your grill. You want to be able to put a fork in it easily but still hold it's shape.
Considering beer brats usually boil for several hours before grilling, this recipe takes far less time.
Although I have not tried it, zucchini or carrots might be a good substitute for the eggplants.
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Eggplant brats with peppers and onions https://snappeasheep.com/eggplant-bratwurst/