Scheduling/Taking the Exams

Based on your situation, here's what you need to know about taking AWS certification exams across different locations:

Regarding your first question: Yes, you can take your AWS certification exam in the UAE even if you booked it while in India. AWS certification exams are globally available, and your passport nationality doesn't restrict where you can take the exam. The important thing is that you have valid identification that matches the name on your exam registration. There shouldn't be any geolocation issues as long as you're taking the exam at an authorized Pearson VUE testing center in the UAE or through their online proctoring service if that's what you've arranged.

For your second question: You can book future AWS exams using your Indian bank accounts and in Indian currency, regardless of where you plan to take the exam. The payment method and currency used for registration are separate from the exam location selection. When scheduling, you'll be able to select a testing center in the UAE while still using your Indian payment details.

Since you already have AWS certifications, the process should be familiar to you. Just make sure to select the appropriate testing location in the UAE when scheduling your exam.
Sources
Inquiry About Exam Scheduling After Registration | AWS re:Post
Certification Exam Registration for AWS Summit NY | AWS re:Post
Tried Scheduling CCP Exam - Payment completed but exam not scheduled | AWS re:Post