Best I can suggest is grow all your brassicas on to 3" pots and plant out as semi-mature plants with a good root system. Make the planting hole large and fill with bought in compost and/or sterile soil and hope this gives enough of a start to get a decent crop.
Had club root on one of my old allotments - absolute pain! The stuff lives in the ground for ages. I managed half-decent crops this way... in other words I only lost half the crop - not 90+ percent!
Could I remind you that wall flowers are also brassicas, if you grow them, and are therefore also going to be affected.
Terry
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