You can swap the hose, but to do it at the shifter you'll need to undo where the banjo goes in, swap it and bleed it.
@Netakure started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
You can swap the hose, but to do it at the shifter you'll need to undo where the banjo goes in, swap it and bleed it.