Is there a way to bind a key in a mode defined using define-generic-mode such as xmodmap-generic-mode? Generic does not appear to create keymaps.

ELISP> (require 'generic-x)
ELISP> (let (result)
      (lambda (sym)
        (when (and (boundp sym)
               (string-match-p "generic.*keymap$" (symbol-name sym)))
          (push sym result))))

Define a keymap variable as usual, conventionally called NAME-mode-map. To use this keymap, the major mode startup function needs to call use-local-map. If you're making your own call to define-generic-mode, pass a call to use-local-map in the function-list argument of define-generic-mode.

(defvar some-generic-mode-map
    (let ((map (make-sparse-keymap)))
  "Keymap for some mode.")
(define-generic-mode some-generic-mode
  nil nil nil
  #'((lambda () (use-local-map some-generic-mode-map)))

If you don't control the call to define-generic-mode, add a call to use-local-map to the generic mode hook. The mode startup function runs NAME-mode-hook (even though it doesn't define that symbol).

(require 'generic-x)
(defvar xmodmap-generic-mode-map
    (let ((map (make-sparse-keymap)))
  "Keymap for xmodmap generic mode.")
(defun use-xmodmap-generic-mode-map ()
  (use-local-map xmodmap-generic-mode-map))
(add-hook 'xmodmap-generic-mode-hook #'use-xmodmap-generic-mode-map)

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