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Di2 climbing shifter without brake levers

Does anyone know if I can plug Shimano climbing shifters straight into the junction box on my stem and run them without using the brake lever/shifter units?  I have taken my Di2 off because I really couldnt get on with the levers (put my mechanical SRAM back on) so I have a R8050 system either for sale (about 2000 summer miles, not used through the winter if anyone is interested in it drop me an email stephen.bulpitt [at] or to be hacked to use with climbing shifters on flat bars for my runaround bike. So, does anyone know if I can run front, rear mechs, internal battery and climbing shifters as a setup?

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