When all else fails, try to follow the instructions in Pub 544.

"Election to postpone gain. Report your election to postpone reporting your gain, along with all necessary details, on a statement attached to your return for the tax year in which you realize the gain."

Don't play the "trick the IRS computer" game. Why do people think it's acceptable to sign returns with fantasy numbers?  Don't zero out anything on a 4797.  You're probably going to have to file an amended return eventually, anyway.  Probably, by the time the 1099-S gets matched to the return.