> Find team building activities that can be conducted via video-conference.

What kinds of things have your tried? or would recommend?

Remote: Office Not Required - https://37signals.com/remote

Looks like Android support is on the coming soon list, you can vote it up https://www.scaleway.com/imagehub/

I didn't read it as that you were saying a 4-day work week doesn't work. Thanks for sharing.