I do something similar with the old Gmail for Domains product (or whatever it was called before Workspace) - it lets me add real mailboxes but also have a catch

I do something similar with the old Gmail for Domains product (or whatever it was called before Workspace) - it lets me add real mailboxes but also have a catch-all, where everything else gets delivered to a specific address. I know this is not available any more so I've done the same with Cloudflare Email Routing which lets you set up a catch-all and is (still) free.