Just tested, EXWM works with emacs-no-x-toolkit!

So I suggest we add the following packages:

--8<---------------cut here---------------start------------->8---
(define-public emacs-no-x-toolkit-xelb
   (package
     (inherit emacs-xelb)
     (name "emacs-no-x-toolkit-xelb")
     (arguments
      (substitute-keyword-arguments (package-arguments emacs-xelb)
        ((#:emacs emacs) `,emacs-no-x-toolkit)))))

(define-public emacs-no-x-toolkit-exwm         
   (package
     (inherit emacs-exwm)
     (name "emacs-no-x-toolkit-exwm")
     (synopsis "Emacs X window manager (without X toolkit)")
     (propagated-inputs
      `(("emacs-no-x-toolkit-xelb" ,emacs-no-x-toolkit-xelb)))
     (arguments
      (substitute-keyword-arguments (package-arguments emacs-exwm)
        ((#:emacs emacs) `,emacs-no-x-toolkit)))))
--8<---------------cut here---------------end--------------->8---

Thoughts?

-- 
Pierre Neidhardt
https://ambrevar.xyz/