I'm not sure why you keep investigating all these weird corner case situations for your Kindle. Go find a proper charger for it and start reading eBooks instead.
Assuming that the charger is correctly made, that the charger type voltage signalling on the data lines is correct, that the Kindle supports only drawing 180mA at maximum and that you're okay with the charge taking significantly longer then yes, it'll work fine. That is way too many assumptions however and Amazon are never going to support what you're doing.
In short, proceed at your own risk. Nobody is going to be able to tell you whether it is safe or not. You're using the charger and the Kindle in an unsupported configuration and both may fail due to this in the future. Just because it works now is no guarantee for the future.
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