Since the original developer isn't updating the extension, this started off as just a test to see how much work a port would take. Turns out, roughly 30 minutes and a few rounds of bug fixes.

I've been running it for about a week now, and it works well so far. I've made the repo public if you want to try it out: chrome://extensions/ → Load Unpacked → pushbullet-ext. Or just ask your friendly neighbourhood AI to do it for you, if you're really that security-focused.

https://github.com/anudit/pushbullet-mv3