mavic Ks have the same problem as many ofther factory wheels... proprietary spokes and rims etc.... u can break anything on a custom wheel and cheaply and easily fix it...
mavic Ks are also usually far heavier than stated and every publication i have read has tested Ks bottom of the barrel in terms of aero and stiffness... add to that hubs of very average quality (including a pointless bushing that wears and causes play in the system) as well as a known issue of pulling eyelets... etc... also, IMO too few spokes (which are costly to replace as well)...
personally i like campy factory wheels, as although they are still using proprietary parts, the quality is much better IMHO, also in zonda and above u get record internals = loose ball... very nice hubs.... why are they not compatible? campy sells shimano freehubs... if 'campagnolo' written on the side is incompatible, then consider fulcrums....
one factory wheel in low profile and weight that makes sense to me is the hed ardennes... nice wide rim feature, low weight and the hubs are regular straight pull, meaning u can easily replace them with cx-rays.... its also a decent 18/24 set up...
then again, i don't know how much u weigh, or if you care about being without wheels for a while incase of breakage etc ( sounds like u have multiple wheels)... at the end of the day, DA hubs, OP rims redone in say cx-rays or dt revolution spokes should come out to 1575g... if u dropped the spoke count to 28h, it would be 1535... loose ball, easily replaced parts (including rim!) and light (easpecially at the rim)... in all seriousness superior than the es... to support low spoke counts, most factory wheels run heavier rims, IIRC the Ks were about 475g or so....
anyway, ur milage may vary, and u obviously like the mavic factory wheels, so don't let me be overbearing and change ur mind...