I looked at these type of things a couple of years back. I ended up cobbling this together.
View attachment 76212
It’s a small standard X Y Table from eBay for which I machined a custom Router mount. I reduced the speed on the router and I’ve made some of my own cutters using small HSS tool bits.
The overall setup obviously moves the cutter from the lathe headstock to the router and the workpiece to the headstock compared to that in the original post above. The setup worked well in tests but I’ve not got round to using it yet apart from that. These type of things work best with dense timbers which aren’t always easy to source at a good price.