Switch currency with language – always overrides

Hi,
I am running Woocommerce with Polylang, and are having a problem when using the code from here: https://currency-switcher.com/switch-currency-with-language-change/
The autoswitch works perfect, but I would like to be able to manually change/force change the currency after it changed to “standard”. E.g. I change from swedish to english, and then automatically from SEK to USD. But perhaps the customer would like to see cost in EUR instead. But when trying to change to EUR, site reloads and use the code from above and stays at USD..

Is there a way to be able to manually change also? Cheers!
Jesper