Has anyone tried taking a table saw DRO and using it to accurately move a router or a tracksaw or anything else along one direction?

I have been thinking about ways to make an MFT-like top and I think I can do it without digital assistance if I don't care how far the dog holes are apart. Really all that matters to me is getting the layout square and reproducible. But I started thinking about how I could keep the dog holes "exactly" 4 inches apart. One idea is to use a table saw DRO, like the Wixey, fixed to a rail of some sort attached to a plywood bed, with a carriage for the router.

It seems to me that there might be some other applications and that someone has tried this in some form or other. Did a search before posting but I didn't find whatever is already posted. Any help?