Oh right, I'm referring to the covers that these 3rd party covers would replace:
Thanks for pointing out the gaskets I'd need...
Would I be insane to consider just sanding them down without removing them? What if I mask off the cables and the other parts and use VHT prime/coat/clear?
If you're careful (& lucky) you can reuse the gaskets at least once.
And no. Masking things like engines generally doesn't work out well. Much better to have the piece in your hands by itself. You can do it on the bike, but it's very fiddley to mask something like an engine.
And don't use "sandpaper". ScotchBrite pads are enough. Get good name-brand rattle cans for both primer & finish coat.
You don't need to buy a respirator for rattle cans. Do it outside when there's no breeze. And hang the parts so you can turn them easily to catch light. Multiple thin coats. If you don't Make runs, you don't have to fix them