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No need for an external junction box - the 910 bar end shifter does that job. You will need an internal A junction to tie everything together, and probably a Y cable for the bars if you're using the bar end junction box. Or a soldering iron.
Brommers-
Rather than Y cable, can’t you just wire one shifter to the other, one cable to the junction box and one cable from whatever free port to the internal junction A cable? No soldering needed.
Didn’t think Di2 was fussy about where things were connected, just that they were connected.
I think this is how I wired mine in my Superzero bars (which are awkward as they have a cable channel under the tops, but the only way you can go internal is through the drilled holes near the bar ends)
Acliff
You need internal and external junction boxes and 2 cables for shifters the rest sounds fine