To remove those pillars, I would lathe turn some punches with brass bar stock to a tight sliding fit in the holes. Leave a solid shoulder to press out the pillars. Use a propane torch to (CAREFULLY) heat the punches and transfer enough heat to the pillars, and then hammer them out. Epoxy resins and glues tend to release when heated up to about 400-500 degrees Fahrenheit.
You can also use standard steel punches. Just make it a tight sliding fit to transfer heat quickly.
You should be able to then drill out the holes to a larger diameter, and then re-glass bed them again.
HTH
John