Hard to tell you what to expect.

PHX used to actually give out booties and drawstring 3-1-1 baggies at their checkpoints. (The baggies had 'Courtesy of Phoenix TSA' printed right on them, but they were not allowed at ORD because they weren't 'resealable' - they had a drawstring instead of a ziploc!).

I took extra booties, like you, I don't want to put dirty feet back into my otherwise clean shoes. Generally not a problem, but at SEA I was told I had to stop immediately past the scanner, remove the booties, and put them in a trash can - before I could get my shoes and bag from the xray belt!

BTW, PHX no longer has the booties or baggies.

I finally gave up. Like you, I just stop before the checkpoint, put my 'flying' socks on over my bare or stockinged feet, clear the checkpoint, remove the socks and put my shoes back on. I have never been challenged (they'll get some serious pushback if they ever start telling people to take off their shoes AND socks!), so I just play it safe.

If you do decide to try the bootie thing, please be sure to post your experiences back here so we can all benefit.