Yes, you could do that.
Actually you don't have to go through the exercise of having TurboTax calculate your vesting income if you believe your employer has reported it correctly on your W-2 (which is most likely the case).
Just enter your 1099-B (say No, not employer stock) and indicate that 'Cost Basis is incorrect' to enter the correct Cost Basis (FMV on vesting date). This may be reported as 'Adjusted Cost Basis' in broker info.
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