Before the water cooled Chinese spindles became popular lots of people used the Kress spindle. It is better made and more accurate than the average router and only a bit more expensive.

https://www.cnc4you.co.uk/Spindle/Kr...ar-UK-Warranty

It will have a 42mm diameter for the spindle which is smaller than the body of the porter cable router but you can buy the clamp or you could rig up an adaptor.

RoboCutters sell a router called the Rhino router that looks similar to the porter cable specifically for CNC applications.

https://robocutters.co.uk/proddetail.asp?prod=Router

I think none of them are a match for the Chinese spindles really.