You can author listing and shipping prices in your own selling currency. Buyers always see and check out in euro, converted at the daily rate.
Open Preferences, then Company. Under Selling currency, choose your selling currency. New accounts start in euro. When you change currency, you can convert existing listing and shipping prices at today’s rate, or switch and leave existing amounts as they are.
After your selling currency is set, create and edit listings and shipping costs the same way as today. Amounts save in your authoring currency. Volume and tiered prices use the same currency as the listing. CSV import reads prices as your account currency.
When you browse as a supplier, you can also pick a display currency on a product page (in the Listings header) to compare prices across currencies. That does not change the currency you author prices in.
Orders, invoices, and payouts stay in euro. A later currency switch does not change placed orders.