I'm almost certain that 230 had the foot holes for a time when she was repainted in Enterprise colors, and as you have said she did have them plated over at a later date. 203 was in Inchicore in Sep 2006, she had the foot holes blanked over and the grilles in undercoat when she was released back into traffic. I can only presume that they had intended to repaint her at that time, however for reasons unknown to me she was back on the rails for a short while in that condition.
Rich,