How can I duplicate languages in my mixed English-Greek online store?

[Mikekir]

Hi all,

I would like your insights on this topic if possible. I have a store that runs in a mix of English-Greek language (this is popular in my country).
All of the store runs in English except product descriptions and policy pages (see photo No.2 below).

We want to expand sell to Europe so I would like to add English as a second language (purely english) and rename the first language to Greek but keep it as it is (mixed).

Note that the existing "mix" language that we use, was created in the default Shopify option English (check the photo below).

Any ideas on how to proceed?

Thanks in advance,
Mike K.