Indirectly dependent slicers

Hi,

sorry, this is my first post, hope this is the right place and my question will be understandable:

I have a fact table PricesWithTax with price per country and date (date/CTR/price euro/conversion rate/price local). If the country uses EURO as their currency, Exchange rate and price local equal 0.

Besides the countries, there are two clusters (European Union and Euro zone) included in the table. These values cannot be derived/calculated from the values of single countries, so I have to keep them declared as they would be single countries.

Now to my issue - there is a region slicer allowing to select single or multiple countries (or clusters). Selecting one of the clusters in combination with other countries makes no logical sense, therefore there is a warning built in, but no hard stop for the user, they can select any combination of countries or clusters, even meaningless. Selecting multiple countries (not clusters) is okay.

Based on the selection of the slicer I am filtering a chart. In the chart, I want to have the option (slicer?) to switch between the Euro and local currency, but I only want to show the local currency option in case one single country is selected that has local currency.

The full logic is - show the local currency option only if in the region slicer one single country, which is not one of the two clusters and has other than EURO currency, is selected. The non-Euro countries can be identified by min/max/sum of either exchange rate or local price >0, but I could even add a helper table with explicit information about countries and their currencies (would be even cooler to not show the switch with the title 'local' but with the respective currency abbreviation GBP, HUF, RON...).

I can't get it work - any ideas, suggestions, hints...?

Thanks in advance