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Hi,
There is no way to force the currency because “Price Based on Country” is not a currency switcher plugin.
Currency is a property of the pricing zone, and the pricing zone depends on the customer’s country.
You can use the filter “wc_price_based_country_stop_pricing” for the plugin does not load the pricing zone.
Note that this hook runs on the WordPress init hook.
The code snippet add_filter('wc_price_based_country_stop_pricing', '__return_true'); turns off the pricing zone loading, so WooCommerce works as default (shop base currency)