For the overriding the standard deduction, on the Form 1040/1040SR Worksheet override line 12c, not 12a.
Adjusting the calculated tax is probably impractical unless the calculation is being done on one of the tax calculation worksheets. However, in forms mode you can open the What-If Worksheet and mark the box at the top of one of the columns to tell TurboTax to use 2023 tax rates and copy column 1 to that new column. You might also have to enter the standard deduction yourself. Unfortunately, each time you change the tax return you'll need to delete any existing column, remark that box to use 2023 tax rates, then copy column 1 again.
