New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  link1: 'https://cdn.pixabay.com/photo/2014/11/30/14/11/kitty-551554__340.jpg',
});

templates.application.hbs

<svg>
        <image
          width=10
          height=10
          xlink:href="https://cdn.pixabay.com/photo/2014/11/30/14/11/kitty-551554__340.jpg"
        />
</svg>
<svg>
        <image
          width=10
          height=10
          xlink:href="{{link1}}"
        />
</svg>

<svg>
        <image
          width=10
          height=10
          xlink:href="{{link2}}"
        />
</svg>

<button onclick={{action (mut this.link1) "https://www.happy-cat.ch/uploads/tx_ggcircleelement/HappyCat_Katzenratgeber_circle_katzenbaby.jpg"}}>change link 1</button>
<button onclick={{action (mut this.link1) "https://www.happy-cat.ch/uploads/tx_ggcircleelement/HappyCat_Katzenratgeber_circle_katzenbaby.jpg"}}>change link 2</button>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}