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You will need to buy a new SSL certificate since those are issued at the domain level. Depending on your needs, you might want to just use LetsEncrypt. I use it for all my sites and have never had a problem (and it’s free!).
As for the redirects, your web server can handle that at the domain level. For example, in nginx you can do this in the aaa.com server block:
If I remember correctly, this performs a redirect on the server side, rather than giving a 301 to the client. I’m not an Apache guy so I don’t know the syntax offhand, but I do know there’s a similar way to do the same thing.
Here’s a really good guide if you’re interested in the finer details: https://www.digitalocean.com/community/tutorials/how-to-create-temporary-and-permanent-redirects-with-nginx