Retirement tax questions

My workaround is to put 0 in Part III, Line 12 of the IRA Info Worksheet (basis for 2019 and earlier years). This makes the traditional IRA cost basis $0 and results in the entire inherited IRA withdrawal being taxable, as it should be (at least for my situation). Since the IRA Info Worksheet is not filed with the IRS, and doing this removes the unnecessary Form 8606-T (for this situation), I don't think this workaround will adversely affect the ability to file, and it does result in the correct tax amount being calculated.