Oh yeah….this was 2009ish. Cable everything….each HB setup had full length cables and matching housing as noted for the front. I would unloosen all 4 cable fixing bolts (2 brake, 2 der), loosen all the stem attachment bolts and just remove pull everything thing though.
Place the new stem / HB in place, run the cables through all the housing left in place and tighten everything back up.
Would be a total nightmare with hydraulics and fully integrated HB systems…if not simply impossible.