I have a Sugnio made Ritchey Superlogic crankset with the hidden 5th hole behind the crank arm. They are very lightweight, excellent gearing spread (48/38/24T), and use a square taper interface. I'm trying to find an equally nice if not nicer crankset with lower gearing potential. Are there cranksets out there that fit these criteria?

Square taper
20T or 22T low gear
Easily replaceable chainrings
Lightweight

In my search I can't have all of the above. 94/56 chainrings aren't readily available, and many cranksets with a lower gear veer towards chunky MTB cranksets.