While the idea of oversize shoes is the correct way to go, I would have made turned up tips (like ski tips) and opted for T1 (hardened steel)
over Teflon as Teflon is soft and will wear away fairly fast.
IMHO, even regular steel is better than Teflon for this application.
On my blower I have 2 X 10" skids made from T1 and the have withstood 4 yrs of constant usage so far.
I agree however that you are on the right track.
The big thing is being careful until it until after the ground is fully frozen. After that I never saw that any sort of shoes really mattered. I have plow sculpted the drive a couple times before I figured out though. The big thing I would worry about with a blower is highly protruding frozen in rocks sticking up. Those really ring my bells with the thick plow on occasion while it might just bend your unit if it caught right. That reminds me I have to go tune my drive before it freezes.
For my oversize shoes I simply cut across the width about 1/2 way thru to make bending easy and then welded the slit closed.
I made about 30 deg bend and used a hand grinder for that cut.
Mad the bends at both ends of the skids as occasionally we do drag our blowers B4 lifting.
Note that I only use the oversize shoes early to get my base set up or until the ground is well frozen.
Then I remove them for the balance of the winter.
\Has been years since I needed to rake back any gravel.