Wow, not sure you'll find a simple solution.
I totally understand why you would want to be able to understand the expected progress based on the baseline. Running off the Global calendar would not cause a problem for me as all our projects/resources run the global calendar anyway, but if you have differences then I agree you would need to run against the project calendar.
I'd suggest trying to speak to your account manager to see about getting some help, though if they suggest PS you'd probably have to pay. Have you tried attending one of the Q&A webinars? That way you'd be able to ask the question to CSM and find out if there is an easy resolution.