Google Maps Integration with non-USD accounts (India)

I'm building an app in India, thus my billing currency for the Google Cloud Billing Account is INR. As per the Google Documentation, we cannot have Google Maps billing in a currency other than USD. So, now I'm facing some issues with integrating Google Maps in my flutterflow application.

I now have to maintain two separate Cloud Projects, one for only Google Maps and the other for rest (Cloud Functions, Firestore, etc.)

Flutterflow takes one Firebase Project and sets up everything according to that project. So, it generated the API keys for Google Maps Android SDK, iOS SDK and Javascript API in my Cloud Billing Project. Should I manually generate these keys again in the maps only project and put them in FF? Will this cross integration work? I tried but it doesn't seem to. Am I missing something?

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