I generated a “hide my email” forwarding address specifically for my HN profile last weekend.

Not via a chrome extension, but it’s pretty easy to generate one on any Mac (maybe even iOS?) in system settings. You can name the forwarding address to have different ones for different uses

Edit: re-read your comment and sounds like you’re already doing this manually, like me. I agree it’s a hassle and would love to see a more native UX that doesn’t involve opening system settings