I am migrating to Angular 4 from legacy javascript, one component at a time.

One key to success is being able to pass data to angular4 components from 
legacy javascript.
I have successfully tried calling components directly by 

1. exposing this from a component, then calling this->method() directly 
from outside angular.
2. exposing an observable from a component, then updating it from outside 
angular.

Both of these requires this.changeDetectorRef.detectChanges() which makes 
me wary.

Are either of these bad - in an angular zen kind of way? Especially 
exposing this feels bad.
*Are there a better way?*

Plunker with examples can be found at 
https://plnkr.co/edit/Ny9kmQrNZTrlmFJZZffo

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