Mono cable will do the job. On the PBC the remote switches are TRS 1-2 (Tip, Ring) and 3-4 (Tip, Ring) with a common ground. You can use a mono cable and use switch 1, just keep in mind that you won’t be able to use switch 2 since they are shared on the same TRS connection on the PBC. You could use a Y cable to break out switch 1 and 2 for separate pedals to avoid this.