How can I cheaply transport lots of baggage when travelling domestically in India when coming in or going out on an international flight?

I'm planning to travel to India from an international destination, and leaving back to the same international destination. My airline allows me to check two bags weighing 50 pounds each, and I plan to make full use of this allowance.

However, when I was booking my ticket, I found that the ticket price to my final destination in India is significantly more expensive than booking a ticket to a major hub airport (e.g. DEL, BOM, etc.) and a separate domestic ticket to my intended destination. I'm aware that if I book a ticket straight through to my final destination, I can carry the full allowance all the way through. However, I've searched around and found that if I book a domestic flight on a separate ticket, I'll only get a baggage allowance of around 15 kilograms (by weight).

As I plan to carry around 45 kilograms of baggage, which is significantly more than the 15 kilograms permitted by most airlines I've checked, it seems like I'll have to spend a lot of money in excess baggage fees. Is there a way I can transport the bags more cheaply than paying those fees, or booking a through ticket, which will probably add hundreds of dollars to the ticket price? Is there a service where I can get the baggage shipped cheaply? Or should I book a train ticket instead?