Now I'm getting somewhere I think. Have found AWRtechnologies in the UK which has what I want ...but at a price. Will put in a link when I'm at my computer.
http://www.awrtech.co.uk/ih/ih_spec.htm
As I mentioned earlier I have an EQ6 board and simple hand control. The EQ6 has 180 teeth. If I put a 2:1 reduction gear set between my stepper and worm gears that should be close to tracking should it not? Thinking out loud here. As an edit I just thought there are gears on the EQ6 steppers so will have to take those into account too.
Thoughts on this approach?