Give the studio projects LSD2 a shot. Its a stereo mic with switchable configs and it sounds damn nice too. There is one for sale in the yard sale section right now. I would try that before jumping to schoeps right away. Plus with that amount of money you save you'll be able to buy a nice preamp in front of it.
Edit: just realized you didn't want phantom, but with a single point stereo mic you can leave all cables connected in your bag and just hoist in on the stand. With a preamp you get these advantages
-Optical output into your jb3 (with some preamps, ua-5, v3 optimod ect) - cleaner signal to your recorder
-Adjustable gain - so if you need to boost your signal you can do it with an actual preamp instead of with the levels on the jb3 much cleaner again, also its a bitch to adjust levels on the sony MD's from what i remember
-Level monitoring - with some like v3, mp-2/mixpre have nice colorful levels
-Save money on batteries - most preamps can run off of lithium ion rechargable or sla batteries thus saving you money
So I would seriously consider a preamp and a stereo mic if you want easy take up and down as it will make it well worth it.