Adding two-way binding property to composite component Multi Combo Box

I need a two-way binding between:
the repeated values (token label and token tags) of this component and
the list of values from my pageVar. Because I want to display that list in the component!
Not possible in the default component, I need to edit it and adjust/add property(ies).

Before I take the risk of destroying my already slightly customized component, can someone please confirm that I should just switch the Label and the List of options properties to two-way binding so I can have the content of my pageVar list displayed by this Multi Combo Box, ie: right token tags displayed and related checkbox checked)?