You did it in a smart way. I like this.
Of course, now that Gutenberg is released we can achieve it in several ways.
If we are talking about ACF only, it’s also possible in a simple way now! You can only create an ACF empty block with an InnerBlock included, and all options in this block (eg Button Group) will be visible in the sidebar.
As a result, we get something like “gutenberg block options”
The problem I am seeing is performance. If you have a lot of inner blocks like container > row > col > content, you have a lot of Ajax queries. As a result, loading this in wp-admin is slow.
