We base our pricing in EUR. Our need was to set fixed price in NOK. Currently doing proof of concept in Shopify Plus.
I've managed to set a mutation (priceListFixedPricesAdd) for a product variant in the admin graphql. To me it looks like this updated correctly with the RELATIVE originType beeing replaced with FIXED, also querying contextualPricing return the correct new value. For test purposes, using €51 and NOK199.99.
However, in Dawn the price is still displayed as NOK508 (automatic conversion?), and same for PriceV2 in storefront API when I query that variant.