Can You Assign User Presets to Keyboard Shortcuts?

I know how to assign an effect, such as Graphic EQ, to a keyboard. But it is possible to assign a user preset WITHIN Graphic EQ to a keyboard shortcut? For example, I have an EQ setting for plosives. It would be handy to apply that via keyboard command rather than have to open the effect and navigate my way to the preset and apply it that way.

Yes. To do that, create a “Macro” containing (only) that one effect. The effect’s settings are stored in the Macro.
You can then create a keyboard shortcut to run the Macro.