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Unobtainium?
Nope - SRM did power meters to fit octalink BBs. Come up on eBay occasionally.
Creaktastic 🙁
Plus one - he said Octalink, not ISIS. I've run Shimano 5500 Octalink BBs for years/1000s of all-weather miles without a creak.
Would it not be easier to just change the BB?
SRM. There’s a track one on the bay now. Track BCD is 140 so ring choice might be challenging. But yes SRM
Personally, I’d go pedal or swap BB
Stages do a Dura ace 7710, LH arm in Octalink flavour I think, obviously intended for track bikes but should work well enough...
Don't forget that there are 2 octolink spline widths .
Not sure which the track used
Why you'd buy a 2-300 pound arm for a dead standard I'm no sure.
You can get power meters built into pedals rather than crank arms (Garmin Vector etc.). I don't know how they compare to crank arm units but this might be a better option as it'll be transferable to new crank sets when/if you upgrade.