Similar solution here. A square of softish rubber (from a dead exercise ball) rolled into a “C” shape and inserted with the open section facing downward. No pooling and very little wind noise.
Definitively not at the same complexity level, nor investment, my quick & dirty solution is to use a piece of rubber hose, cut on its length, and rolled on itself, providing a reduction of section.
With changing the hose diameter, when bigger will require more turns, hence reducing even more the remaining air passage.)
The only issue is to not lose it after cleaning !