The trick I have used in the past is to have a hidden dashboard prompt which 'catches' (no added plumbing required) the drill action on the main report, having the drill pointed at the same dashboard page for any of the reports which is correlated, on the hidden dashboard prompt setting a presentation variable which is the filter on all of the analyses which are not on the same subject area.
Or for those on the same subject area you can use the prompt section to catch the prompt.
The presentation variable trick can also be useful for displaying the currently applied filter via text area or headings in reports.
This is tried and tested and in many a production system.
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Also, but I never tested this, I do not see why you could not set up a master detail solution to get multiple analyses to all listen to the same channel.
But as I say, I have not tested this idea.
Thanks I used a combination of your ideas and it works beautifully.
Liking the master slave that is very useful.
Master detail, sorry, must have been thinking about the weekend