What chemical solvents do you have access to? Some paint removers for aircraft and other durable finishes have methylene chloride and other aggressive solvents in them that will denature the epoxy enough to get it off. If you have chloroform, soaking in that may help. Nitric acid is also a good reagent to try and should not affect a ceramic.
How hot can you get the parts? At about 150° to 175°C, the epoxy should start to soften and may be peeled off.
As stated previously, you need to balance the cost/risk of getting rid of the epoxy vs. just buying new parts.
John