Whether they're purple on the shelves is no indicator of ripeness. After all, the jalapeños in your store are green, no? All the purple peppers I've seen - even Black Pearl - ripen to red. Your question was "Would purple work for this or should I let them turn red?"
As I said, I'd wait, but that's only a preference. You might try some now, and wait on some to try later. IMO, you want them ripe for powder, unless you want purple powder, which could be a thing. So your call.
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Stupidity got us into this mess. Why can't it get us out?
- Will Rogers
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