The client doesn't want to create 2 websites for 2 base currencies. But they want the prices of the alternative currency to be rounded to 0.5 or 0.9. The pre-calculated prices should be shown on listings, product pages, cart page etc.
Example: Price in base currency: 5 GBP. In EUR it would be ~6.31 but should be shown as 6.5.
Is this possible at all?
Magento version is 1.9. The currencies are GBP (base) and EUR.