Templates helpers format data onto your templates, but one must ensure that subscription data is fully loaded before the template helpers have a chance to render.
With the help of Iron Router, use the ‘this.ready()’ check inside the data option.
Once the above is in place, a template helper can now safely rendered the subscription data.
As of Meteor 18.104.22.168, this can not be done. The Blaze to HTML looked promising, but this only creates static html element from a template, it does not provide the ability to render an active Blaze template inert.
For example the following template has a click event listener attached, but there is not way to undo or remove the click event listener.