That's a tough call. the Propoly 4AA isn't that heavy or large, but mounted on a helmet (presumably one side) for a long period -- I don't know.
I just tried my Propoly 4AA up close, and it's mostly not that bad. I wouldn't use it up close with dark adapted eyes at night, but for most circumstances it seems OK, just not optimal.
One advantage of a tight beam is it's usable up close, just not optimal, plus also at longer range. By contrast a broad beam is only useable up close, not at longer range.
Whatever light you get, I'd suggest getting just ONE initially to evaluate before you buy a bunch.
As previously suggested, my best recommendation would be two lights -- the Propoly 4AA plus the $15 River Rock 0.5w headlamp.