You can do a landing any time without a PSAL on an outfield ALA but would be very foolish to do so.
I was not the pilot but was some miles behind and made the Pan call....our procedures we thought were very safe....an accident on landing seemed a far higher risk due to a surface problem than an engine failure.
And I would still assess that as being so.....however, having been involved in this, I am unfortunately far more nervous of flying in single engined aircraft especially at low level even if it is a requirement,