That list of people doing it would also include Renishaw as described in a machine shop magazine some years ago. They came to the conclusion a VMC could do the milling and most of the lathe work more economicly than any other method. Without a robot and just a custom pallet changer it could load and unload both parts and tools from a pallet.
I personally produced lots pulleys used with hoses up to about 12" diameter on a bridgeport size CNC mill I had a tool block bolted to the table with an Aloris Lathe toolpost.
I just finished a similar tool block to hold an Aloris tool lost on our much larger CNC bed mill at work. I am also machining a Cat40 tooling block so I can use some of the 50 holders we have with taper drills, boring bars and such. I already have adapted a Cat40 shell mill holder to mount a 5" 3 jaw chuck on the spindle, and we have collets from 1/8" to 1-1/4" for small stuff.
A few weeks ago I machined 32 aluminum stanchion bases for my sailboat from 6061 aluminum. I did the threaded mounting hole first then used a threaded arbor to hold them in the spindle. I used the CamBam lathe programming to produce the G-code and it worked really great.
This is really a workable concept, think gang tooled lathe and tilt your head to the right while looking at the mill if it makes you feel better!