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Re: FIX for water Ingress via Scuttle Panel
No need to go to all that trouble. If the incoming water reaches the level of the pollen filter inlet then the drains are blocked BIG-TIME. Your idea may prevent water getting inside the car but what about all the other aspects of the wiper system.
In my Lag II just lifted the front edge of the scuttle panel poked around with a strightened out coat hanger whilst gently pouring in some water. I soon discovered whilst the drains were clear the speed of flow was insufficient to allow the water away quick enough. In other words the outlet flow couldn't match what was coming in.
Off came the the rear wheel arch liners of each front wheel. The outlets were completely blocked with crud gathered up from road debris and dirt. There is a one-way valve type thingy on the end of each outlet - designed to discourage vermin from climbing up. Once these were removed and the area thoroughly cleaned the water poured in disappeared like the perviable sh&& or a shovel.
Raising the level of the pollen filter opening is similar to raising the height of a dam at times of flood when the more effective answer is to have more efficient sluice gates. Check the lower end of the drains you may be surprised at what gathers in there.
Currently in madnoel10's garage:
Honda Civic 1.4l