(define-module (my-emacs)
  #:use-module (guix packages)
  #:use-module (guix utils)
  #:use-module (gnu packages emacs))

(define-syntax-rule (define-my-packages (var-name pkg) ...)
  (begin
    (define-public var-name
      (package (inherit pkg)
        (name (string-append "my-" (package-name pkg)))
        (arguments
         (cons* #:emacs emacs-no-x
                (package-arguments pkg)))))
    ...))

(define-my-packages
  (my-emacs-ag emacs-ag)
  (my-paredit paredit)
  (my-smex emacs-smex)
  ;; ...and the other packages you need.
  )