Belexes, it sounds like you've already heard shows with the 4061s, and you've decided that you like them, so I wouldn't pay attention to our debate about them. Just trust your own ears and what you like, and go with it.
I don't know if anyone answered your original inquiry, but you can use your current SP battery box, but you will have to get your 2 mics and solder them to a stereo miniplug (or have someone else do it...) - most people get them from ebay w/ lemo connectors, and cut off the connectors. But the problem here is that they are often not very well matched.
There are some mathmatecal/analytic reasons to believe that the DPA pres/bb's sound better than the SP battery box, but I've never done an A/B blind comparison to hear if its an audible difference. I made that jump, but I changed everything in my rig at once, so I can't single out the improvements and relate it to a particular gear change.
I'd strongly suggest NOT purchasing new ones with microdots if you are going to cut the connectors - you're just wasting money then.
my 2 cents, hope it helps.