newegg/cdw/etc are probably on their list of approved providers, so what probably needs to happen is that you need to get the keyboard you want, let's say another rk-9000, approved for use, then have IT source it.
the evoluent handshake mouse is almost certainly already approved because evoluent spent a lot of money convincing the public sector to certify their devices in hipaa situations and used the empirical research that handshake reduces occurrence of work-related RSI significantly to push everything through. so, for the mouse, i'd go with that. IT shouldn't have trouble getting you one, and it's a really comfortable mouse.
the RK-9000 is a newegg house brand keyboard and there is no way they're going to go through the effort to push like evoluent did. that said, it's almost identical to a lot of keyboards that might have been approved.
actually, before you move forward with trying to get an MX-switched keyboard, make sure that unicomp isn't an approved vendor first. afaik unicomp does a fairly large amount of public sector business who have to source their products as replacements for old IBM keyboards.
if they aren't, try looking for anything in the approved list of vendors and p/ns that look like they are deck or TG3 boards. TG3 sells a ton of boards into law enforcement; i think most of us have bought a rebadged police interceptor workstation keyboard from a surplus outlet at some point. the next vendor i'd look at is adesso. they have a long history of supporting macs institutionally with input devices and were die hard alps-style switch customers at one point. they currently have two MX boards in their lineup:
http://www.adesso.com/products/product-sort2-16.htmlthe last vendor that i think might be able to pull this off that i can think of is matias. afaik, prior to the new switch and models, edgar matias sold a lot of keyboards in mac-locked markets as replacements for AEKs and i have no doubt that he can navigate this space if it makes sense to him. that said, i don't know if he's pursuing it with the new line, but they're great boards and he has a bunch of cool ergo models as well. also, his organization also doesn't have the kind of corporate lethargy that some of the bigger companies (logitech, namely) have, as he demonstrates every day on this very forum
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anyway, the one thing i'd like to emphasize is to _not_ try to split hairs on this one. there's nothing really sensical about most rules in public IT. i'm going to take a wild guess that there's very little keeping someone from sneaking usb keys inside the cases of all their stock of approved keyboards and accomplishing max exfiltration despite the security rubrick, or just like, using their phonecam to take a picture of a sensitive screen.
i have friends who work on projects whose operational security departments have their stuff together, and you have to go way way beyond not letting people bring in usb devices to maintain op sec. at probably the most notable workplace i have friends at, the _last_ line of defense is a building-mounted anti-aircraft battery.
