I have run into the issue of the Basic Hosting plan having no seats for editors on multiple occasions now.
I typically build/host sites on my Workspace/account for every project. The issue arises when a client wants access to make simple changes to their site when they only have a basic plan, as there are no editor seats offered.
How do you approach this? Do you upsell clients to the CMS plan? Transfer the site the a client account & share a password?