The humbuckers should not be a problem, the single coil centre bulge with the exiting wires will be the reason for the mods, if it were me I would install the humbuckers first and leave the centre EMG there just to fill the hole until I could work out the single problem as it would be a shame to deface such a beautiful guitar (I hate scratch plates anyhow) maybe Tim could build a single coil with end exiting wires! like some SDs!