Ouch, that's a solid hit — glad it wasn't worse. You're definitely not alone; that magnesium cover is a known weak point on these bikes. I haven't seen an off-the-shelf reinforced cover yet, but a few riders in the [specific bike forum/model group] have had theirs custom-fabricated from aluminum or even machined with a slight lip to protect the mating surface.
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My go-to for precision motion: The Nema 17 stepper motor. A reliable workhorse.
Installed the new Dowa cover yesterday, and I can confirm the protective lip also works with the rear footbrake.
(on the website they mention it won't)