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Most hotel WiFi networks enforce device isolation too, so I don't think you can 'see' the chromecast even if you could authenticate it. The workaround is to create your own hotspot, bridging the hotel's WiFi to your own 'travel router,' using a laptop.

At that point, it's probably easier just to watch Netflix on the laptop... :-/

Chromecast has guest mode now, you can set up without being on the same WiFi network.

Why not change your laptop's MAC address to that of the chromecast, authenticate on the laptop and then plug in chromecast?

Client isolation prevents routing of multicast packets for device discovery.

Guest Mode?

Some hotels I stayed at went as far as disabling HDMI ports on their TVs, which is extremely annoying.