Howdy KM2015,
Welcome to the Unreal Archviz club!!!
I feel you and i have been looking for ways to present to clients in a seamless, easy to use experience.
There is a ‘plugin’ available for touch navigation. swipe, point and the sorts. I think this is a ‘must’ for easy navigation on tablet. Will cost about $10USD though.
https://www.unrealengine.com/content/ef6a59e5f9354b4dab3e4902a84aa8fc
Like what heartlessphil suggested, i think appstream or X.io(never tried this myself) is the way to go. Put it all together and you get something like this!!!
Realtime UE4 Archviz on android tablet. - YouTube
All your client needs to do is download an app on playstore and a good internet connection. 