Everyone here is an end-user like you. To get feedback someone at Apple will see, use this link:
Chose the Mac model your school uses and you will get a screen where you can enter your comments.
Best of luck,
"Looking for a compact, non-10-key, WIRED, USB, Apple compatible keyboard (that has brightness and volume controls built-in)."
Depending on your budget, you can find just about anything you want if you check the internet for computer peripherals. The biggest problem with the keyboard that you want would be its high price tag and finding a large (new-in-box) supply of them. I'm never surprised at the availability of keyboards that were never used with the computers that they shipped with. After Apple discontinued the ADB extended keyboards, I was still able to find new ones for my older fleet of beige G3s. As a less expensive alternative - but one that excludes your preference for brightness and volume controls - you may wish to consider a reasonably-priced, USB-wired keyboard for PCs, like the compact one shown at this eBay auction. A PC keyboard will work with a Mac, except for any programmable function/media keys that are part of the Windows software installed with the keyboard. One distinction between an Apple and a PC keyboard is the placement/juxtaposition of the two keys on either side of the space bar: The Windows logo key and the Alt key. When used with a Mac, the Windows key becomes the Apple Command key and the Alt key is the Option/Alt key. For your use, perhaps you could place a permanent sticker with the Apple "Command" symbol on the Windows key. In an elementary school lab, the stickers might be peeled off as soon as you've replaced them - which would be a nuisance.
I bought one when they came out knowing it would be my exclusive and favorite keyboard for a long, long time. (It is a shame the wired version is gone.) It's made the transition across 3 desktops now, and with a little Mr. Clean Magic Eraser every couple years, it stays looking brand new. But I digress...
Your best bet is checking out ebay to see what you can find, and possibly even find a bulk sale of them - as rare as those sales are. Jeff's answer above is one of the most helpful I've seen - and I agree, completely. The cheapest alternative, as you mentioned they were for elementary school kids, would be the most ideal.
while looking around for one myself, i found this:
likely one of the original manufacturers, minimum order is 10 keyboards.
i have no relationship with them, only need one or two myself, and am not sure i want to pay 50$ each. but since my search had me look here right before i looked there, i decided to come back and provide this answer, in case you are interested. there is another vendor selling them there also, with no price listed. use the search box at the top of the page, and look for "A1214 apple" or you will be buried in random parts.