Number pad

• how cool... use the motherfucker upside-down...
• even better... just like the dedicated one-hand chorded keyboards

Standards

• GKOS - 6 keys (two-handed)
• braille typing - 6 (two-handed)
• thumbscript - 9 keys (implemented!)
• half-qwerty - >15 keys (my implementation, an older implementation)
• a different half-qwerty

AutoHotkey

• 7KAT