How to bypass templating in e-newsletter to create new template?

How may I bypass the whole “template + content builder” in order to use an automatically generated template, from custom content ?

I was thinking that I could update the ‘enewsletter_newsletters’ table because that is what the builder does, doesn’t it ?

Especially, I’m able to develop any template required and to pull any content from the DB.

All I need is information about where to store stuff in the DB so that I may just press “send”

If there are any manual steps left, such as chosing an e-mail title or selecting a mailing-list, that’s fine, but the main task is to save time building the e-mail, since I have all I need to generate it with a custom function.