So is your PM a Quarq, P2M, SRM or Stages with SRAM GXP crank arms?
If the first 3 you could just get new BB30 crank arms and swap them out on your power meter spider. They are interchangeable for SRAM crank arms (both BB30/PF30 and GXP have the exact same spider interface). If you have a Stages then you can't.
3 Bolt SRAM cranks are easy to find (Force 22 / 1x cranks all have that setup). If you have 8 bolt setup like the new DZero models or Quarq Elsa RS (I believe those are 8 bolt too) then those are bit harder to find on the new or used market.
If the first 3 you could just get new BB30 crank arms and swap them out on your power meter spider. They are interchangeable for SRAM crank arms (both BB30/PF30 and GXP have the exact same spider interface). If you have a Stages then you can't.
3 Bolt SRAM cranks are easy to find (Force 22 / 1x cranks all have that setup). If you have 8 bolt setup like the new DZero models or Quarq Elsa RS (I believe those are 8 bolt too) then those are bit harder to find on the new or used market.