similar situation at my end. the only twist is I have 30 hours in the past 3 years. but my RTR(c) expires in sept and I can only apply 3 months before date of expiry.
My 30 hours expire in april.
I visited sanchar bhavan, the guy there suggested the same. get 30 hours monitoring the radio from any flying club and get RTR for 20 years else take Part 1 again.