I've just had the same situation with one of my SD20's. I pumped out 1 liter every second day till I could get to a yard to have it hauled out & have the seals
replaced. They checked everything on disassembly & pronounced it all good.
After every pump out the milky colour was getting better. I'm not saying you can rely on this in your case. But it work for me.
They were able to move the position of the new seals a bit so that they weren't in the exact same position on the shaft. They also pressure tested the new assembly before the boat
went back in the water to ensure that the leak had been repaired.
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Seabreeze, Lagoon 380 #241
Innisfail, North Queensland, Australia ... Cruising the waters of the Great Barrier Reef