We can handle wildcards now, we just issue new certs when we see new subdomains (we have a 2500/wk rate limit from LE and will implement SANs if you need them). Feel free to email I'd you want to set it up. :)
Yeah A/CNAME to us and then you can use our API to issue certs of all subdomains or if you have a wildcard cert already you can upload that with us. Either way works :)