The Kinesis Freestyle Edge has 12 such keys in that position. The mechanical gaming version (RGB) allows them all to be arbitrarily mapped, and function keys are one good use of them.
I'd even settle for a 12 key keypad on the left as well - that might be more doable. Looks like I might have to build this myself from scratch ...
If running under the Visual Studio debugger, you can also press F12 with the debuggee in focus to break into the process.