Can drill replace reciprocal saw?
No, there isn't really a drill accessory made that will make that job easy. I wouldn't bother with any cutoff or grinder wheel. It would take a very long time and would chatter and bounce around a lot. 

Beg or borrow an electric saw, or use an abrasive circular saw blade, or use a basic hacksaw. You'll probably want an angle grinder to flatten the cut, and you could actually use the grinder to make the cut. 

The long and the short of it is that a drill isn't your huckleberry.