Add Welcome Currency or Default Front-End Currency

Can you add in free or pro version of plugin ability to select “welcome currency”, so everyone (include search engines & bots) who visits the website first time saw prices in certain currency.

For example:
I have default currency set as EURO, but I want default currency on front-end set as RUB (russian rubles) for everyone.

The reason why I need this functionality, because on the back-end I have all prices in euros, but for front-end users I need to show prices only in russian rubles. I know that I can select all countries for russian ruble and none countries for euro in plugin settings. But the promlem is when search engines & bots indexing my website they see prices in euro, and in search results for my products people see rich-snippets with euro currency, not in rubles.

Or maybe you have some hook or filter that can set default front-end currency?

Thanks!