Snips ,Google Assistant, Alexa and users account

Hello,
I am newbie in all these staff (Hass.io, snips and so on) and i would be gratefull if someone could point me the best approach to my overal idea.
Lets say i would like to control a hotel with voice. i could put a snips in all rooms and each room could be controled by voice with snips. in this case i didnt need hass.io or just a general one for the whole hotel for more powerfull options. Lets explain the following step. I want to give granted access to a customer to control the room with his/her own mobile. Lets say they have google assistant account or Alexa Account. I would like to give access to them accounts temporaly. As I have seen, i could isntall a Hassio with the three conectors (Alexa,Google and Snips) and give access to the users accounts. It would help if the app that the user should install was the most simple and light, only config porpose. Lets start with doubts:
1- how to join google/alexa account with hassio account? how to give and delete this access? As i have seen, google Assistant allows more than one user for a house but once you grant access you can not delete the access. I gues Alexa is more or less the same. Alexa has also a new feature especifically for hotels but no detailed info about it.
2- Could be added new google or Alexa user within any existing hassio funcionality. is some feature that must be developed?
3- IsThere any light app for config hassio component in google or alexa mobile account?
4- Does it has any sense at all? or am i flipping out?

Thanks