Never have OneCNC for Intergex. It was three years ago..... they give us a quote for lathe module is $3200, but that is mill/turn not Intergrex and I assume the Intergrex post will be sold seperate, the post can be expensive.
My recommend you should look at Esprit DP technology, their specialty is Intergrex or simular configuration machine, and I know the intergrex post is come with the software. Draw back is it's more expensive than Onecnc. FeatureCAM is another one you should look at, not pricey and can do the part you asked.