Air India flights can be booked indirectly by transferring points to another star alliance partner. You can try United for this. Indigo flight redemption using points-to-miles is simply not possible.
You can book the flight without transfering points to any airline frequent flier program by booking directly using travel edge portal.But the Edge point value in that case reduces to 25 Paisa,though u earn accelerated redemption points on additional payment made from your Magnus card.
Indigo not possible.
Air India you should check on Turkish miles and smiles. It usually has the better rate. You can also check on united and krisflyer