Did you ever get a response on this?
I looked at it today and I am a little confused about the goal
You created 2 sets and those sets are independent of one another - so you can place them on the same viz alright but you don't see any interaction between the sets - was that your goal? if so you are there
as far as using parameters to allow users to define (create sets) sets - not a good idea - parameters by there nature are single valued and the user selects from a predefined list of options meaning you would need to have a parameter for each dimension and then only a single value would be chosen - also the parameter value will remain constant until changed by the user and finally the parameter value is global - the same throughout the workbook
Parameters don't do anything in themselves they need to be backed up by a calculation or a filter so the logic for that would also be a consideration
If this posts assists in resolving the question, please mark it helpful or as the 'correct answer' if it resolves the question. This will help other users find the same answer/resolution. Thank you.