What bike are we talking about? Dual discs? Is it a splitter we are talking about or the block where the brake light switch is? If it is a splitter, there is no advantage in losing it, and you will have 2 lines running along your handlebars to the master cylinder.
For the brake light switch, Honda went to a mechanical switch in the brake handle in the later years, while earlier used a hydraulic switch in the block. You list bikes that may have either.