How to replace price to another currency in Woocommerce? : I need the help of the community.

I use a visual product builder that allow my client to build their own products and I need multi-currency support. The problem is that i can't use multi-currency plugin because the visual builder doesn't support it.

Mi question is : How modify price of the cart for other currency ?

I need for example to modify final cart price like this
10€ > 15$
20€ > 20$

Thank you very much