Why can't I edit pages of another language in the basic editor?

The basic editor most clients use doesn’t work great on my website because it’s really laggy, and most importantly, you can’t edit the different languages of each page which I added with the new localisation options. The editor within the designer works great for this all, but now i have to put the website in it’s own workspace, which i have to pay for, and I have to add a seat for the client as well. It doesn’t make sense to me why localisation is released but you can’t edit it if you don’t have a seat in the workspace.

Please let me know if I missed anything or if there is a workaround. Thanks