So, current currency used is RUB, which doesn’t make a lot of sense. Just because Russia is a neighbor, it can’t be justified. You might as well use Turkish Lira and it will be fine I guess? If GEL is not an option, just use international currency like USD, which happens to be the most used foreign currency in this country and everyone knows exchange rates. Every other store (Steam, Epic, Origin) uses USD, like, it shouldn’t be that difficult.
Here you can see foreign currency deposits data, by National Bank of Georgia: www.nbg.gov.ge/uploads/depozitebiqartulad/inglisuri/deposits_structure_dstreng.xlsx
which hopefully shows to you how widely used USD is compared to RUB