If you have room for a Bridgeport - there is your answer. If you look honestly at the cost of having machining, especially CNC in your garage, paying a couple hundred bucks for a rigger to deliver the machine is nothing.
If I had the space for a knee-mill I would have started by buying a 3 Axis CNC bridgeport or something. You can score those for $5-7K easily and you are ready to run.
But I don't have the space, so I'm spending more money and investing over a year of my free-time to do a conversion. Add up all the cost and time to get what you want. The investment in the mill itself is pretty small for the typical conversion. Especially when thinking high-precision, large table, stainless..... What's your total budget and timeline.