The size thing is very hard to get around, the differences are so massive it's truly a shock I think to most people the first time at least. I know it was for me.
What I was trying to get across is if someone see's your pics and
then asks you if he's SQ, he might be just perfect for them. It really depends on what their plans are for him. If they want him for local/country/4-H/FFA/youth type fairs and shows and the competition is other hatchery stock (this covers probably the bulk of people) if you're honest with them rather than just a "NO!" and price him accordingly, I don't see a problem.
They also might be confusing SQ with able to be shown, as in, is he a crossbreed or will I (my child) be able to enter him in a specific class. That's probably what at least half the people who ask are really wanting to know.
Someone with serious aspirations quite probably knows a great deal more about the BAs standards and would have more specific questions. They also are more likely to seek out breeders through a specific breed club.
IME with exhibition breeders so far, the more reputable ones rarely jump in with a "Yes, absolutely!!!" if asked "Is this bird SQ?" They don't seem to even like the term very much. "Does this bird have any DQs?" is usually more easily answered. They're constantly working on improvements and sometimes it seems there is always something they'd like better on each bird. The absolute perfect bird, well good luck getting them to part with it without significant amounts of cash that only a select few would spend for a bird and that's only after they try for GCH at nationals and see what kind of chicks they throw.
The ones I've gone with have asked what my plans are and have been very helpful with finding birds without DQs in my price range that will work for my showing/breeding plans.