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You've got each shifter going into one port and then the third port with a wire down to the B junction?
You can run a wire between shifters directly so you only need one to the junction which frees up a port and you can reuse the old shorter wire for your new shifter. So buying one long wire for left to right levers
PhilDAS
@MisterTomTom
I'm thinking of buying a secondhand SW-R671 shifter to shift at the rear when in the aero bars. I have an older Di2 setup with the external 3 port junction box. Is the cheapest way of getting it in the setup with a Y split cable instead of getting a 5 port junction box?