keyboard layout - Map a key combination to get the CAPS LOCK behavior on Windows 10

I want to perform two key mappings that are nonstandard:

1. Caps Lock key will become another CTRL key.


2. Some combination of keys (ideally, Shift CapsLock) will still be able to do the job normally performed by the CapsLock key -- toggling capitals.

It appears that the standard answers — SmartKeys, AutoHotKey, and Microsoft Keyboard Creator (MSKC) — don't map the CapsLock key, and/or don't map a combination of keys. I would love to be shown otherwise.

I am capable of editing a keyboard (.klc) file or the registry, if I only knew what to put there or what to change.

FYI: I have read that Shift+CapsLock does the CapsLock job on a Japanese keyboard.

Before you ask: why would I want to do that? Because I'm a Unix guy, so I learned to expect the Cntl key to the left of the "a" where it is handiest.
And because sometimes you REALLY WANT to type several words in call caps.