Do you know a ready made unit where Kelvin Probe is used?
There are many. The other thing it can be called is
4-wire measurement, because a Kelvin connection uses 4 wires/contact points.
There are many ohmmeters, LCR meters, etc that are capable of both 2-wire and 4-wire connection.
Have you used one? It uses principle of capacitive coupling.
I have used several, but nothing like the SKP5050 with it's robotic scanning arm. None of them used capacitive coupling either. They all had 4 physical contact points with the device under test. (DUT)
The Kelvin thing is just a minor detail about the SKP5050 (I'm not even sure if it qualifies as using Kelvin measurement techniques). You can't really compare a Kelvin ohm or LCR meter to that thing.
I can't use the Kevin Probe because of need to make big Faraday Cage. Does it cost thousands of dollars? If you have photo of it. Please share.
You don't need a Faraday Cage to use a normal kelvin probe setup. But if you could afford to buy the SKP5050, which needs it, you could afford to built one.

Some DC Kelvin LCR/ohm meters do cost thousands of dollars. You can DIY a DC Kelvin test with two regular multimeters, resistor, and a power supply if you're willing to do the math.
I am retired now. So no photos available.