The author/maintainer of doom emacs is amazing but also very nice, I think you should try to open a MR to include your work inside the project, which would make it even smoother to enable and also easier to discover
Yes! Doom Emacs & Spacemacs are recipe books, not necessarily concrete products you have to use in prescriptive manner. Any Emacs user can make use of their modules, some of them are full of interesting gems. I'd highly recommend exploring them for ideas.