pop-up notifications from a widget

What's the proper way of showing a pop-up notification from a widget?

So far I updated widbt_notify to use the following code:

// NRF.on('disconnect',
var tId = setTimeout(load, 3000);
E.showAlert(/*LANG*/'Connection\nlost.',­ 'BLUETOOH').then(()=>{
  // ok clicked before timeout
  clearTimeout(tId);
  load();
});

The problem I get is that if the watchface calls its draw() function while popup is still visible, the popup screen is (partially) overwritten.

I checked other widgets:

$ grep showAlert wid*/widget.js

But it seems there's no other examples.

One solution would be to complement a widget with a tiny app, which is launched only to show a popup. Sounds like an overkill. Is there a better way? If not, is there a way to ship a widget with an app, while hiding the app from the launcher?