I've wondered the same thing, but I completely agree with dactylus. I've never had a problem carrying both and the results speak for themselves. I haven't tried the mics direct to the recorder, but I have a hard time imagining that the results would be quite as good without the DPA pre that provides optimal power, has better build, more quality components, costs a bit more than the recorder itself and is designed around the mics. I haven't done a comparison to back up that assumption, but since it's really not much of an issue to carry both I don't worry about it much.
DPA makes microdot > various wireless transmitter adaptors. Two of those might work along with a 'Y' cable with a stereo mini on the recorder end and the appropriate wireless termination on the other ends.
Type DAD6007 (AKG PT 300) seems to be a straight-up mono TS 1/8" jack & perhaps your best bet.