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The "wading"plug in the bellhousing should have been left out to prevent the buildup of oil.
It should only be installed when actually "wading" through water of a depth which will put that plug level underwater.
Hopefully the clutch plate will gradually dry out enough to reduce the shudder. When starting off on a uphill don't increase the engine revs beyond what is required to get the vehicle moving.
You may eventually be up for a new clutch and main and/or gearbox seal and we can recommend outfits that are used to doing this.
Before all that see how you go letting it dry off a bit and reducing the startoff revs - less loud pedal.
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