I tried this: https://docs-old.ckeditor.com/CKEditor_3.x/Developers_Guide/Toolbar - replacing the contents of include/thirdparty/ckeditor_34/config.js and/or include/js/ckeditor_config.js with the example to no effect.

Keeping the original content and editing the "var a = ..." line in ckeditor_config.js to remove entries causes more (duplicate) toolbar buttons to appear?!

Ideally I need separate toolbar configurations for Simple_Blog and normal page edits...

Edit: OK, I somehow managed to overlook Typesetter's configuration page... Copying and editing there works fine, so far so good. But how to have different configs for Simple_Blog and everything else?