It can be safe if you know what to do, not over breed him, having him feed through the season etc.
Honestly I have tried breeding smaller males over the last 10 years and I was never successful, I found that me males to best at 650 grams and over.
Ultimately you can do it you just need to be very careful and not get your hopes up, the one thing you have going is age but it is small for the age, if he is a problem feeder that could be an issue.
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