By checking the Box on the Sched D you are generating the 8453. It says so on the misc options smart worksheet

On the 1099-B worksheet i just report the gross totals of each category (LT,ST, Covered,non covered)

I  DON'T check that box on sched d and just attach a PDF of the trades and select 8949 from the drop down list of the PDF attachment menu. Always works for me.