Users (guest) invited on folder level, inherited by all board in folder

Hi all,
I build a bid management solution and need 4 different board to manage one bid / tender. This is because I need different columns for planning, documents & issue logs together with different board permissions. To create a new bid I have to invite all guest to all 4 boards that are combined into one folder.
I would love to see the ability to invite guests on folder level and that all boards inside the folder inherits the users on the folder level (unless overwritten at board level) or alternatively create a team of guests (see also other topic) and be able to give board access to this team.