I don't know if I would use a 1 wire bus part. I would rather use a SMBus part so you could bit bang it using serial flow control lines. SMBus has very low timing constraints compared to 1 wire bus.

Link to various SMBus parts from Maxim

Some of them have local measurements, so you don't have to have external thermistors added (MAX6648 for example).

You probably won't have to pay for them if you can get free samples (1-2 parts).

If you had a SMBus header on the motherboard, you could possibly just plug it in without much of an adapter board. You would need some wire, a couple of pull up resistors, and a VCC bypass cap. This is potentially how I am going to connect my Nixie computer display (if I ever get started on it!).