Here is a numeric example to highlight flaw in your so called "business plan".

Lets say I send you 10 BTC at current market price to invest. Now you cant invest BTC in any guaranteed return scenario. You have to invest the FIAT and like you said you choose to invest them in govt securities in India. Thus, you will go ahead and convert 10BTC-> INR and at current rates that would come to be around 250,000 INR.

Now lets say you put this money in whatever investment you intend to and generate a 6% return. Which means you will have 15,000 INR as retrn or 265,000 as total cash on hand.

Now you have to give me a 6% return on my BTC, which means you  have to give me 10.6 BTC back. The ONLY and I stress the ONLY way you will be able to do that is if BTC->INR exchange rate does not change. Even if BTC appreciates by 10% to say 27,500 , which is sooo much possible, you will need to cough up 291,500 to give me back my 10.6 BTC. Hell you will need 275,00 to even give back my 10 BTC. How will you get the difference?

Your plan is exposed to a significant exchange rate risk, which you are not even taking into account.

I suggest members to do their math before investing in this. I am not calling this scam. I believe its just poor investment