hi
You have some ways to solve your problem.No need to do anything with your Indian FRTOL now.
1. you can renew your RTR(p) by submitting a valid foreign radio licence and valid foreign PPL/CPL. submit it with wpc and get renewed or fresh RTR(p).
2. you can apply wpc exams for getting RTR(C) or RTR (A)
3 if you have a valid RTR(p) / RTR(c) / RTR(a) then your FRTOL is also valid upto its expiry date. the number is not a matter. privilege and validity is the matter.
Good day