Help with keyboard for BangleJS2 - Multitap/T9 layout

Ah, great about Bangle.removeListener()!

Generating the layout anew when exiting onHelp() makes the buttons pressable. I suspect there's a better way to do it though.
Test here.
Code here .

What I changed (line 1, 7, 12 and 41 below):

function onHelp(resolve,reject) {
  Bangle.removeListener("swipe", onSwipe);
  E.showPrompt(
    helpMessage, {title: "Help", buttons : {"Ok":true}}
  ).then(function(v) {
    Bangle.on('swipe', onSwipe);
    generateLayout(resolve,reject);
    layout.render();
  });
}

function generateLayout(resolve,reject) {
  layout = new Layout( {
  type:"v", c: [
    {type:"txt", font:"10%", label:text, id:"text", cb: l=>onHelp(resolve,reject), fillx:1},
    {type:"h", c: [
      {type:"btn", font:fontSize, label:letters[1], cb: l=>onKeyPad(1), id:'1', fillx:1, filly:1 },
      {type:"btn", font:fontSize, label:letters[2], cb: l=>onKeyPad(2), id:'2', fillx:1, filly:1 },
      {type:"btn", font:fontSize, label:letters[3], cb: l=>onKeyPad(3), id:'3', fillx:1, filly:1 },
    ]},
    {type:"h", filly:1, c: [
      {type:"btn", font:fontSize, label:letters[4], cb: l=>onKeyPad(4), id:'4', fillx:1, filly:1 },
      {type:"btn", font:fontSize, label:letters[5], cb: l=>onKeyPad(5), id:'5', fillx:1, filly:1 },
      {type:"btn", font:fontSize, label:letters[6], cb: l=>onKeyPad(6), id:'6', fillx:1, filly:1 },
    ]},
    {type:"h", filly:1, c: [
      {type:"btn", font:fontSize, label:letters[7], cb: l=>onKeyPad(7), id:'7', fillx:1, filly:1 },
      {type:"btn", font:fontSize, label:letters[8], cb: l=>onKeyPad(8), id:'8', fillx:1, filly:1 },
      {type:"btn", font:fontSize, label:letters[9], cb: l=>onKeyPad(9), id:'9', fillx:1, filly:1 },
    ]},
  ]
  },{back: ()=>{
  Bangle.setUI();
  Bangle.removeListener("swipe", onSwipe);
  g.clearRect(Bangle.appRect);
  resolve(text);
  }});
}

  return new Promise((resolve,reject) => {
    generateLayout(resolve,reject);
    g.clearRect(Bangle.appRect);
    Bangle.on('swipe', onSwipe);
    layout.render();
  });

.
.
The help message is a good idea! Maybe it can be displayed directly on first launch as well?
Something like this at the beginning of the promise:

var settings = require('Storage').readJSON("kbmulti.settings.json", true) || {};
if (!settings.firstLaunch) { onHelp(resolve,reject); 
  settings.firstLaunch = false;
  require('Storage').writeJSON("kbmulti.settings.json", settings);
}