Both Google domains and Cloudflare Email routing have wildcard/catch-all email forwarding. You probably can't reply from those email addresses, but you can receive/have email forwarded to those addresses. I have had this setup with Google domains, I now have it setup with Cloudflare email routing. In both cases it's free, but you need to have the domain on Google domains for 1) or add site to Cloudflare (and use their name servers for 2).