Although not exactly cheap, nice 4130 forks for a front 250w motor are Surly disc truckers. With my G370 I had no need to alter the drop outs and the motor fitted perfectly.
Tbh I could but they would end costing more than the whole bike not to mention outlasting the bike as well. Nice to add that name/brand though to the future build list for me and others who might be looking.spend the pennies for better quality