Handicapped with a smaller torch if you really want to make it harder.
Not sure of anything else to help locally we don't have the necessary terrain really for low vis locally.
Good point about Night-o. Haha I always seem to give myself that handicap anyway by forgetting to charge my headtorch.
But yeah I think more practise in thick trees will be helpful - get used to making the effort to check my map properly when I have to use my hands to fight through the forest