Ember Checkbox -- Accessing model property from different controller

I have a checkbox on a modal popup and need it to be checked based on the value on an unrelated model. The model is Team and the property I need to access is called syncAccount (boolean), so the input helper would likely look something like this:

{{input type="checkbox" name="syncAccount" checked=team.syncAccount }}

How can I access or bind to team.syncAccount from the modal? I have a ModalImportController, but no associated route. Is there some way in this controller I can assign a property that looks up or binds to the value of syncAccount for the current team (and is updated as they toggle it)?

Similarly, I need toggling the checkbox to send an update request for this field. Will this need to be an ajax request, or is there some way to set the model used by the checkbox to point to a team so that I can call @model.save()?