No, that makes total sense - my mother-in-law's mixer has a big plastic cover that keeps it clean while it sits on the shelf.

All you would really need to do is measure it, work out the right height and width needed, and then either do the two-pieces sewn together or the like-a-hat-but-not with a circular.

I'd say you could take a teapot cosy pattern and make it larger/longer as needed, and just making sure the spout bit is sewn up.