I agree, that seems like a much better way to do it.
Only issue I had with the desktop version is that Line 12e of Schedule 3 is not an editable field. It jumps me over to the 1040/1040SR Wks > Schedule 3 Part II: Other Payments & Refundable Credits > Line 12e.
You can not edit this field either, but if you go up to Line 11 in the Deferral for Certain Schedule H or SE Filers Smart Worksheet, it allows you to put in the amount you want to defer up to the maximum amount on Line 10. If you put in $0, it will make Line 12e of Part II amount blank as well as Line 12e of Schedule 3 for Other Payments and Refundable Credits as they are linked.
This solves...
1) the error from Sch SE-T
2) it allows you to put in the correct amount of your income from 3.27-12.31 on Sch SE-T Line 18
3) eliminates deferral of SE tax payment
Thanks @AmeliesUncle! Not sure if that helps out @jnlkepner as well.
