You could have used ATF instead of kerosene. Then you could have idled the engine for a couple of minutes at a time, with a filter in place! Or gone the route of an expensive engine cleaner. But not having a filter in place did not buy you anything, it just made the kerosene dirtier. You might even have caused a bit of rubber to get stuck in a block passageway.
Don't blame the PO for the sludge, most shops in 2006 used conventional oil, and if he drove it to work he probably never got the engine oil up to operating temperature. I think our local Volvo dealer didn't start to use synthetic oil until 2015, cheap bastard...
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Keeping it running is better than buying new
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