Currency Conversion On Checkout Page in India is not working

[Orionminds]

I have to sell items from India in US market. While I am able to install apps to convert my currency from INR to USD on all other pages, It changes back to INR on Checkout page. I also have chat with them but they said as shopify manage checkout page so no app is allowed to change currency at checkout, only shopify payments can do it, and shopify payment is not available in india, please suggest how can this conversion be achieved on Shopify Checkout page without using "Shopify Payments"