As long as you have an exposed chain that you have to periodically lubricate, you're going to get some fling onto the wheel.
About the only time I see less of it is after I clean my chain, lube it, and wipe off the excess. Then let it set overnight to allow the solvent to evaporate.
It stays relatively clean for a short while, but then with each re-application of chain lube, it starts to grime up the wheel.
Years ago, many European bikes used to have fully enclosed chains.
To lubricate, you just popped open a cap over the rear sprocket housing and dribbled some oil into the chain housing.
Since the chain was fully enclosed, it was never exposed to dirt, water, etc.
While not quite as "racy" as exposed chains, they did last a good long time this way.
For an example, look at the first photo at this link.
You'll notice the black chain housing around the rear sprocket.
It had rubber bellows that joined the forward section that allowed chain adjustment.