I’ve got those on my Premier 2000. I briefly considered getting a key for it till I discovered they sell for around 100 bucks on eBay (or at least they did in 2014). I use a Mac screwdriver that’s a perfect fit in the slot. I’ve also eyeballed T-handle screwdrivers but never pulled the trigger on it (something like this).
What kind of Mac screwdriver? Like one for a laptop?
Any help is greatly appreciated!