Just recently joined the "CBX network", most impressed with the knowledge and level of assistance offered by everyone.
I've recently requested a set of replacement foot rest rubbbers (drivers pegs). To remove the old material, I've found that heating the whole footrest component in the oven at 250-270C for 15-30min aids the job of a neat removal. Loosened the glue enough to enable me to use screw driver and prise the whole rubber from the metal base. Take care with the heat, I used a vice and oven gloves.
Karl