What keys / "switches" are available for Alternate Pointer Actions?
Solution 1:
You're not going to be able to assign a complex keyboard shortcut to the Accessibility/Alternate Control Method. The reason for this is to simplify the process of right clicking, not to remap it to something else.
From Apple Support:
We build powerful assistive technologies into Mac to give people with physical limitations more ways to be creative and productive. Switch Control lets you navigate what’s on your screen with a single tap. And a range of settings let you adjust interaction sensitivities for an experience that works for you.
What this is looking for a a whole different device (like a key switch device) that where the user presses a button, it will be mapped to something else. You can use the function keys, but you'll have to un-map them first (F11 and F12 aren't mapped, so they're "available.")
... they're a bit of a stretch for my hands so I was looking for something closer to home row.
Finding something on the home row is really not feasible.
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⌥ Option and any of the charachterss on the home row are already bound to unicode characters: åß∂ƒ©˙∆˚¬…
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⇧ Shift⌥ Option as well: ÅÍÎÏ˝ÓÔÒÚÆ
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You may have some luck with ⌘ Command⌥ Option and assigning it a shortcut, but is this really easier than a single keypress like F11?
You could "make" a separate device with a USB or Bluetooth Ten Key (Number Pad) and with USB Overdrive or ControllerMate program one of the keys of the keypad as either right click or left click.