On the one hand, Krita has already implemented the new plugin Workflow Buttons in the Krita NEXT versions, so the current 5.3.x series, which will allow you to freely put together tools and more. It is presented here in short, and it will be a stock feature of Krita.
But, on the other hand, you can also use the plugin Quick Access Manager, it gives you more than you asked for.
I’m not sure if the first plugin will fulfil your request entirely, but it may be exactly what you are looking for, in which case your request can be closed. Unfortunately, the second plugin is only available for Krita’s desktop versions and cannot be considered a complete solution to this request because it is not usable by Android users. And that although it offers all you ask for.
Michelist