Loxe | Flux implementation | Reactive Programming library

I am working on a shinydashboard app and am trying (see reprex below) to point three different menuSubItems to the same tab, while also updating a tabBox on that tab that corresponds to the menuSubItem a user clicks on.

Rationale: I am implementing this so a user can navigate to sub-pages more easily depending on where their cursor is, i.e. over the sidebar or on the page.

Current state: As you can see in the code below, I am 85% of the way there thanks to this helpful response using javascript (tabs_js). The script I've written assigns the actual text in the of the clicked tab to input$activeTab, and then updates the selected tabBox panel using an observeEvent conditional on the changing input$activeTab state.