Fail safe level sensor for AWC and ATO?

Is there a way to set a additional level sensor to be a fail safe for ATO and AWC functions? Basically, if the top sensor for AWC doesn’t register a full condition then a second sensor will sense the condition if it’s reached.

I don’t like a timed fail safe as my only option.

For ATO yes (there is a 2 level ATO mode) for AWC no (here you would need then 4 sensors)