Get your taxes done using TurboTax

You are correct that the Form 1099-R needs to be split, but there is no need to enter these as substitute Forms 1099-R.  Just enter them as regular Forms 1099-R without explanation.  With no tax withholding, the details of the Forms 1099-R that you enter are not included in your e-filing, so the split necessary to accommodate TurboTax will be invisible to the IRS.