The easiest way to have several one (1) key 'commands' that work with AutoCAD, is to purchase a macro-enabled device - I personally use a Logitech G602 Mouse (months of battery life, BTW!), G510S back-lit Keyboard, and I used to use a G13 as well... Yes, for daily CAD production.
These unique 'keys' can be assigned multi-key macros such as (see below), and use recording software to capture each KeyDown, and KeyUp event:
Code:
<Shift> "_" </Shift> "x" "l" "i" "n" "e" <Enter> </Enter> <Shift> "_" </Shift> "h" <Enter> </Enter>
... Or simply:
Code:
<Shift> "_" </Shift> "c" "e" "n" <Enter> </Enter>
Another way to manage your keyboard shortcuts (aka 'aliases', see Acad.pgp), depending on what version you're using, is this custom Managed HotKeys plug-in.
Cheers