Well, It's not my superior knowledge, I am just saying what the press told me
It's possible for IAF to dip into USAF active inventory too. Although the chance are not that great. It would take more than 10 C-17 to transfer the Production Line from Long Beach to India I supposed, otherwise it does not quite make sense to move the whole production line to India just for 10 C-17, the line itself cost around 5 to 6 billions. Although I don't think it's possible for Boeing to Transfer the production line at this stage.
However, the production line is owned by Boeing not the USAF, so maybe if India want to put enough order they can reopen the line to fill the quota, but I would imagine the number will not be 10, more like 30-50...(Which will cost India about $20-36 billions)