I wouldn't for a variety of reasons. The volatile oils in cayenne, which give it flavor and aroma, volatilize (i.e., become a vapor and leave the plant at temps below 40°C (if you can smell it, that's volatile oil not in the cayenne, anymore). Zapping it in the oven like you did also zapped flavor and aroma, and possibly heat. I wouldn't use it for that reason, alone. But wait, there's more. You've had thousands of little beetles and larvae crawling around in that powder, leaving behind silk and cocoons, egg cases, eggs, feces and formic acid. Nothing I would want to put in a sausage for myself or anyone else. JMO, of course.
Don't tell me the odds.
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