I just did this and found my new best friend! I connected a piece of invisible track of each end of the tunnel, then laid the unconnected tunnel track directly on it. Perfect! The train appears to be on the tunnel track while I stay above ground...Thanks for the tip!You too, eh.
Stumbled upon a specific circumstance to achieve that -
Was building a 600mm route and the specific tunnel I wanted to use was standard gauge only.
Put it in place then pulled a 600mm track spline clear through it, ignoring the tunnel end track attachment points.
Since the train does not ride on the tunnel track the view change does not get triggered.