Maybe you need to look at the problem from a different approach.
I don't have the details of the requirements but it sounds as if your problem is not a technical but an architecture one.
Look at your data structures and processes and don't mix back-end with front-end!
The MDO is not there to present the data to the user in a specific way but to aggregate data dynamically or serve as a simple DB.
What the user sees should be based on this info, processed and presented in a smart & intuitive way
If you need a lot of flexibility and complex queries you might even consider client side databases. These can be created and manipulated on the fly and might serve as the data model for your presentation. maybe indexedDB or dojo?
And of course, you can go and look at frameworks like Angular.js