If the Unifying Received require a software install, I'll have dig out the Apple keyboard :/
I would definitely keep it handy. 😁 But maybe the Unified Receiver is plug and play. I use it on a Windows laptop but don't really remember what setup involved.
I have a couple old Apple keyboards lying around but I didn't have enough AA batteries on hand to power both mouse and keyboard. Would have been completely out of luck if I didn't have that Satechi lying around. Or I guess my fastest solution from there would have been to run and pick up more batteries.
Another thing is that I think the Mac wants to see the mouse first so it wasn't apparent that the Satechi kb would work until I got the Magic Mouse connected.
Aside from all that, which did waste about an hour, setup was very smooth for me.