When I first built my LR2 I used this 1970s-era router. I made a custom Y-plate to fit the router holder pictured here. The the router just plopped right in there and I was good to go.
Then I got the laser, and decided that the easiest way to mount it would be to make a laser holder that fit into the router mount.
Then I bought the Makita router and had to make a new Y-plate; but after a week or two of using it I wanted to use my laser. How to mount it? What if I have some other tool I want to use?
So I designed the quick-change Y-plate system.
There is a permanent plate that is attached to the mounts like normal. It is mostly a hollow plate. I added some slots for adjusting the torque on the bearings.
The router and the laser each have their own plates to which those tools are permanently affixed.
To install one tool or the other you simply put it in place under the permanent plate, insert 4 screws and twist on 4 wingnuts.
It now takes about 3 minutes to change tools, including swapping electrical and air connections.