Sorry, due to all the moving parts, ACBC isn't very customizeable. You can add additional questions to any page in your survey, but you'll need to consider the difficulty of merging those outside questions with the conjoint data, which is very difficult to access in the raw form.
The calibration concepts exist to reconfigure the none utility post-utility estimation. You don't have any control over which concepts show up for those tasks, and the algorithm intentionally shows both good and bad concepts.
If this part of your analysis was very important, you might consider switching to a CBC task that has some built in tools for customizing the questionnaire.