Actually, what you are trying to do with layouts can be accomplished with a macro.

Here is how I've rewrote the code from your README:

(defmacro main-layout ((&key title) &body body)
  `(spinneret:with-html
     (:html
      (:head
       (:script :src "https://whatever")
       (:title ,title))
      (:body
       ,@body))))

(defun main-func ()
  (main-layout (:title "Hello World!")
    (:div "Hello World")))

And when I run it, I'm getting this result:

CL-USER> (main-func)
<html lang=en>
 <head>
  <meta charset=UTF-8>
  <script src=https://whatever></script>
  <title>Hello World!</title>
 </head>
 <body>
  <div>
   Hello World
  </div>
 </body>
</html>

But for my projects based on Reblocks framework, I'm using generic functions for template composition.

For example, here is the main "layout" for the page, defined for any Reblocks app. It calls render-body generic function. And in Ultralisp I define a method for it to show the real page content.

The same way, widgets (a smaller pieces of the page) can define their own html in their render methods and these blocks can nest each other. For example here, I'm wrapping each page widget with the "frame" widget by calling make-page-frame function. This frame widget defines site's menu and sidebar.

I believe, everything you want except layouts is already available from Spinneret #1

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