Some progress:

1. Replacing the kmacro-exec-ring-item with the lower level
execute-kbd-macro works


(defun om ()
  "Keyboard macro."
  (interactive)
  (execute-kbd-macro [79  77  32  98  104  85  114  98  104  117  118  97
72  32  115  117  118  97  72  116  97  116  115  97  118  105  116  117
114  118  97  114  101  110  121  97  109  98  104  97  114  103  111  32
100  101  118  97  115  121  97  32  100  104  73  109  97  104  105
100  104  105  121  111  32  121  111  110  97  72  32  112  114  97  99
104  111  100  97  121  65  116 10]))

2. The misbehavior on the last 10 was because it was in Lisp Interaction
mode <grin>

So now...
If I can produce that vector from elisp rather than python I guess its easy
after that...

Thanks again Nick!