you only need to change the axles, bearings are the same size in the 10mm & 14mm hubs, even both the axles outer diameter is the same (20mm) just one is drilled for 10mm and one is drilled for 14mm
(have a 10mm hub here and a spare 14mm axle so know they fit)
unfortunately ive not seen anywhere that stock 10mm axles, only 14mm ones and even those are getting thin on the ground now
you will prob be best off selling them on and try to buy some 10mm ones (im hunting for a 10mm front)
downside to selling them on is they arent worth much, roughly £20 per hub for the homers, even the original fat shaft mk1's i had only sold for £70 (should have kept em)
good luck and please dont grind the dropouts out