Crumbs! Did I memtion I did this in a single engine as well..........
17 years and tens of thousands of landings our strip has used this system and no deaths or damage yet. If the runway lights did fail and sometimes we even simulate it we just use the landing light and land.
I sometimes think that people get way to reliant on technology, lights PAPI etc. There is no magic to landing at light! Line up with runway, set your descent rate, switch on the landing light and flare at the right time. Easy!
As far as approval is concerned, there is non required and who cares about ICAO standards, this is a private strip and if you cant land using the basic kit you are not welcome.
And with a thousand night landings under my belt I can assure you there is no drama about using it. In fact I am just in from the LAC flour bombing day after surviving another night landing.