Setting a Variable based on user input from one visual only

I have a report that has a Display Currency selection on it, using a slicer. The user can choose between USD $ and GBP £. Depending on the option chosen, visuals will sum over either a column of US Dollar or GBP Values. So, if USD is selected, the visual might show $120, or £100 for example.

The problem that I have is that whenever the user selects an element on another visual, it reverts the selected currency back to the default (GBP). This is because I'm using the SELECTEDVALUE function, but of course the SELECTEDVALUE changes when the user clicks on another visual. This happens whether or not there's any relationships or interactions defined between the visuals.

I ideally want to avoid having to create a duplicated report in both currencies and use bookmarks to move between the two, as it's clunky and frustrating to build.

Ideally, I want to have a variable in the background that stores the value of the specific slicer that controls the currency view, so that any other slicer selections will not alter that value. Is this possible?

I have used field parameters to filter across the different visuals but this still causes the value to "reset" every time the user clicks another visual/slicer

I see you are using the Enlighten World Flag Slicer, which unfortunately works more like a visual than a slicer. It unselects your previous selection when selecting other visuals.

I recommend creating a Tile Slicer and using image URLs as the slicer. Here is a quick explanation:

Add an Image URL of the flag to your table.

In Table View, select the Image column and change the data type to "Image URL".

Create a Tile Slicer and use the new Image URL column in the slicer. It will automatically show the flag. Then you can resize and change the borders as needed.

For a more detailed walkthrough, check out this video.