Applicable alternatives to Dropdown when there are only 2 Options

Attached below is a concept for a entry field which leads to a Donation form. The intention is to have the user enter their donation amount in their preferred currency (EUR or USD) then proceed to the form by clicking next.

However, I am not sure of the best way to switch between EUR and USD while keeping the UI simple, making it clear that there are two options and also making it usable on mobile.

See my concept below :