Miracast is a Windows 10 supported mobile display solution with increasingly surprising ubiquity. You currently can't expect every hotel room TV to support it yet, but a generic Miracast stick (or Amazon Fire stick if you want a branded one) can be obtained pretty cheaply and is small and easy to tote around.

Microsoft has a folding bluetooth keyboard that fits in my pocket and is surprisingly nice to work on despite the size.

Keyboard, stick, phone, phone charger is just about all I need to be productive, and with a bit of arrangement I can fit all of that in carpenter's jeans pockets.

I think MS has several plans in motion but has been slow to get all of the moving parts in place. The Creator's Update and "Redstone 3" to follow sounds like some of those plans are finally starting to converge (now that the basic infrastructure is in place).