Use cert_issuer instead of cert tools to create certificate?

As I understood Cert_tools repo is used to create a blockcert certificate. &
cert issuer can issue certificate ,ie put them in blockchain network.

But I have a querry-

Can we use cert_issuer to both create and issue a certificate?

i.e Can we skip using the cert_tools and directly use cert issuer to create a custom certificate which we can later verify and view?

You can very much create your own tooling to create blockcerts documents, as long as they comply with the blockcerts spec. Then if you want to generate them from the issuer, you could also, but that would be in a separate step as the issuer only takes the candidate documents and sign them. So essentially you’d just be merging cert-tools and cert-issuer.