If its powdercoated properly to start with, itll never be an issue, then heli tape over the rest of the stand, and then for good measure, fit the plastic cover that bmw have fitted to the new 1250, jobs a goodunCentre stands on all my BMW's have ended up with gravel rash and rust , the last 2 LC models being worse than previous ones , the problem with powder coating is that as soon as you start to use the stand the coating on the feet base will be breached and rust will begin and then eventually migrate below the coating.
When the stand (cross brace) on my current LC (which has already been repainted at 2500 miles) needs redoing I'm going to remove the stand , have it blasted and then galvanised before painting it properly .................. probably blag some decent truck chassis paint

Not the best pics., but you get the jist

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no im making it up
go and have a look at one for yourself, you are right the bit thats exposed is facing downwards at the road, but the plastic cover sits proud of it hiding it from the front wheel, so when in the up position, the crossbar is up inside the guard as opposed to sitting flush or exposed, like i said the pictures dont do it justice, the most you get now is there are two drain holes in the guard for when its in the up position, you get water run thru obviously, but thats it, my stands helitaped aswell, and after 700 mile is still perfect,