Ahhh, the center stand with panniers question. Part of it depends upon how often you need to centerstand it.I went into my garage today and tried getting it on the center stand using the suggestions listed here. NOPE!
I just can't grab anything with my right hand that's "behind" the pivot point. My panniers are in the way. But I'll keep trying.
It's like those 3D pictures that used to appear in our Sunday comics section. You can stare and stare and just see a blur. But then magically, you see the 3D image. I hope that's what happens here.
Option A and easiest
Take the left pannier off (or both if practicing) and see if you can find a comfortable grab point with leverage. The panniers come off quickly so it doesn't add much effort unless they are loaded or you need to put it up often or when out and about.
There are strap tie downs on the panniers, perhaps running one down, under, and up the other side (or with some interesting support runs) might give a handhold which would be helpful. As I don't have panniers, this is just spit-ball engineering in my head based on pictures of the RE panniers.
Hope there's something helpful here.