Sorry the pain is causing so much difficulty -- glad you have some 'medicine' that helps.
My thought about contamination via tools was just that it might bear on whether your soil is natively contaminated or whether an imported RKN problem had been spread, which might impact what past and future steps might be necessary and/or work best to deal with them. You do seem to have several good ideas in mind -- hope they get rid of the nematodes -- at least the wicked ones -- permanently.
It's interesting to read about your progress. I haven't had RKN -- or at least haven't seen evidence of them -- but with gardens if it isn't one thing it's six others . . . so they may turn up any season, I suppose.
