why are you so averse to form 1040-X ?
get PDF-fillable 1040-X and its instructions from the IRS website. Enter "2020" in the box above your name.
all amounts above line 18 are not changing so column B is zero
after Line 18 you have to do the arithmetic, get a calculator.
Do not include your old 1040 nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.
No other forms or schedules will change, so all you have to do is date, sign and mail form 1040-X,
Mail to the address shown in the Instructions.
