This is not about paying, budgeting or accounting. But it may be a good to mention that SURF Research Cloud takes care of licensing for Windows.
Research Cloud arranged for Windows Server Licenses for workspaces on SURF HPC Cloud and on Azure.
For other cloud providers, arrangements still have to be made.
Also on SURF HPC Cloud and Azure, Windows workspaces are equipped to handle up to 50 simultaneous logins via remote desktop.