I have not read all your posts about Chunks needing entropian surgery, so forgive me if I ask you something you already told everybody
Your vet is experienced in entropion surgeries, correct? Don't take his word for it... ask him for references. The reason I say this is because a vet ruined 2 of my bulldogs eyes with entopion surgeries, and they do pretty many entropion surgeries a year, but after they ruined 2 bulldogs on the only 2 I have ever needed it done, I asked around and was told NEVER to take any dog there for eye surgery even Cherry eye! So just ask for some of the bulldog owners phone # that have had eye surgeries done there before.
I never seen a collar like that before... it would be great if it would work! Looks a lot more comfortable then those plastic collars. The only reason it ain't going to work is he can still rub his eye on the sofa or things that are at his eye level or maybe even be able to get down to the floor to rub his eye on the carpet. Winston went absolutely crazy with wanting to rub his eye after surgery I pitied him soo bad! But that soft collar might work a week or so after surgery... I would get it and try it, because they need to keep the plastic collar on for at least 2 weeks and Winston got so sore around his neck and by the second week he didn't get so itchy.
Good Luck! I will be praying everything goes smoothly