onyerbike-
If you get an R600 climbing switch and gut the internals you can solder flying leads onto the contacts, like this:
So if you connect the blue lead to the black lead, it shifts down, red to black it shifts up. I've then chopped a Di2 cable in half and soldered each half to each pair of leads, so there's an 'up' Di2 cable and a 'down' Di2 cable. Each cable goes into a Junction B box, and each Junction B box has two Di2 cables going into it, both of which have switches soldered onto them. On the base bars I'm using Cateye remote buttons (now discontinued, part number 1699200) and on the extensions I'm using some round rocker switches. The soldering is fiddly but there's nothing intrinsically difficult about it.
Obviously everything upstream of the hacked R600 shifter, while it uses Di2 cables and junction boxes to connect everything together, isn't E-tube. They're just dumb switches soldered onto Di2 cables.
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Brommers
Been there, done that. My P5 has Magura hydro brakes, a 1x setup, and twin base bar and extension shifters all driven off a very hacked R600 shifter. Let me know if you want more details...