By the way Jason, I tried your suggestion of using inside the items of toolbar for eg.
{ template: "<label>#=window['TopNavBarComponent']._test#<label>"},
This normally would work in plain old kendo with our without angular1. However, this doesn't seems working in this hacked version after converting the kendo widget in ngAfterViewInit block. Above code just gives me plain "#=window['TopNavBarComponent']._test#" without any substitution as content of the label item of the toolbar.