Well, there’s isn’t a tool for it, but it’d be easy to make.
We have mouse drivers already available that can do things like dispatch a left/right click or scroll event when there’s 3 fingers, etc. So someone would just need to make something that’s configurable where you can set what you want to control. For example, instead of having 3 fingers scroll, you could set it to fire a alt + 3 key command or something. Does that make sense? It’s basically like having a configurable mouse/keyboard driver.