If you’re going to anodize this yourself you will probably not be using the chemistry required to deposit a 0.002" “hard” anodized coating. It will be more like 0.0001" thick and not likely to make the thread grow significantly. If you’re worried about it you can screw a nylon screw into the thread before anodizing. Nylon screws are slightly oversized and compress when screwed in. If you dont think that seals the thread well enough, add some teflon pipe tape to the nylon screw threads.