So far, from what I'm seeing, it looks like the ThruNite lights (TH20 headlamp, Archer 1A v3, and T10 XP-L) might be what I'm looking for. I'm a little unclear on the precise switching mechanism, but their "firefly" mode is attractive.

I wish the T10 had something between firefly and 13 lumens, and something between 13 lumens and 252 lumens, though. 13 lumens is good for walking the trail, but too bright for non-task use. I almost never need a 252 lumen utility light. Something around 80-100 lumens is better for battery life and bright enough for most things.
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Gemma Seymour (she/her) @gcvrsa