Not directly applicable to the original question but because we have also added universal joints to the discussion, I would like to again share something I found many years ago.
The problem of excess grease splattering in the engine bay can be avoided by installing a more heavy duty version of the correct universal joint.
That version has rigid grease seals (not rubber) and no zerk grease fitting. It is permanently lubricated from the factory and serves here in the very hot California central valley for many, many years in agricultural water pump applications, where the motor, driveshaft and pump are often directly exposed to the elements or sheltered by the bare minimum of a protective shed.
I do not know if a version of the stock universal joint is available with this rigid seal design.
Larry