I suppose there are two points of view on dings and dents. Are you a player or a collector? If you're a collector just keep your uke in it's case and every so often have a look at it. That way it will remain mint and undamaged.
If you are a player, then you gradually have to accept that as your instruments have a life they are not going to remain pristine. And so what? Does a little dink here and there matter? In my opinion not in the slightest, they show that an instrument is played and loved. My expensive (to me) hand made Fylde guitar has loads of dings but it is played regularly and loved. Is it as pretty as when it was brand new and unblemished? In some people's eyes probably not but in mine they are part of the guitar's character and soul. I've seen a high end Martin guitar with the sound board worn right through creating a hole in the top. Did it sound any worse? No. Did the owner still play and love it? Yes.
Do I like deliberately distressed instruments that are made to look like they've had a life? No. Do I like real, aged instruments complete with dings and scratches that can tell a story? Oh yes, I love 'em!
My advice is leave your Pono as it is. Look on it as a right of passage rather than a blemish. If your partner had a scar would you love them any less? Of course not. So what, your uke has a ding; carry on and enjoy it. And guess what? If you play it regularly over the years, not only will it sound better but it will more than likely gather more dings and scratches and you'll still enjoy owning and playing it.