We are extremely sorry to inform you that we do not ship the products outside India. Further, we also suggest you buy it from Singapore only so that you can get the warranty for the product. Only Apple iPhone X comes with the international warranty.
iPhone 8 does support fast charging. Apple iPhone fast charges up to 50 percent in 30 minutes when you use an Apple USB-C to Lightning cable and one of these adapters: Apple 29W, 61W, or 87W USB-C Power Adapter.
Yes, iPhone 8 is slight heavier than iPhone 7. Apple iPhone 7 is 138 Grams while iPhone 8 is 148 Grams.
Yes, iPhone 8 does have the OTG support.
Yes, iPhone 8 does support fast charging.
No longer the gold standard, the iPhone 8 is still all the phone you need.