It sounds like you have all the bases covered. I always clean install Windows on a new system. I, like you, want to make sure all the bloatware is gone. I would also suggest you look at Macrium Reflect Free (available here)  as I find it to be very user friendly. After you install Windows 11 make sure to back up that install as well just in case you have problems down the line after installation. I also agree on the BIOS update installed by SA problems. The forum is full of users that have let the BIOS auto install with dire consequences. Just make sure after the clean install to grab the chipset drivers first along with the needed GPU. This Dell page suggests order of installation but steer clear of any Dell suggested software, if you do not want SA and other Dell base support programs, and of course BIOS updates if the system is running fine.
I'm going to do a Clean Install of Windows 11 on my Dell Inspiron 5515 laptop, which came with Windows 11 pre-installed. I'm first going to use the Dell OS Recovery Tool to make a bootable backup of the factory image that came with my laptop, just in case. And I've already used the MS Media Creation Tool to make a Windows 11 install disk to make a bootable USB to install win 11 from. My goal is to have a clean system, without any residual clutter from uninstalling things like MacAfee and the numerous Dell items like Support Assist that came preinstalled. I know the dell stuff is meant to improve reliability, but Support Assist already froze on me in the middle of installing a BIOS update, and that kind of help can completely brick a computer; I'd rather just download the individual updates and install them manually. So I am definitely never, ever going reinstall or use the Support Assist app again. I've worked in tech support before, I know what damage a botched BIOS update can do. Plus I just plain hate clutter on a Windows system, you never know what leftover registry entry or other junk will ruin your day down the road. I will delete all the existing partitions on the disk; the Windows 11 Install will completely reformat the disk, create new version of all the needed partitions, and install Windows. I'm wondering if any of you have already done something similar; if so, please share anything you think might be useful with me. 
Share your Clean Install of Windows 11 experience...