Cost price based on supplier unit price with currency conversion?

I buy a lot of products from outside my own country, but sell in my local currency. It would be fantastic if the "Cost Price" would be updated daily based on main supplier and with a currency conversion. I.e. I purchase a product at 10€ as listed in the supplier reference and set as main supplier. That would, during a night run update the cost price from say, 10* 10.50 (=105 SEK) to for instance 10* 9.90 (=99 SEK) instead of me constantly updating that manually.

This would be an excellent plugin or similar I'd gladly pay extra for.