One option would be to report this sale as a simple sale of "plain-vanilla" stock, stock that's no different than a stock you bought through your broker (as long as you know or can determine your correct cost basis which it appears that you do).
After entering the 1099-B, answer NO to 'is this employee stock ' which will avoid having to enter vesting info, stock sold for taxes, etc. Moreover, the amount of the spread at exercise of the NQSO has already been included on your W-2 and reported to the IRS by your employer.
@JTAIW
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