[bArray]

What I'm looking for is a differential signal tester, where you can breakout any arbitrary cable or traces and test the properties of the wire with different frequencies. It should be able to measure interesting properties such as resistance, capacitance, inductance, phase/length difference, wire length, etc.

One of these devices for approximately $100 would sell all day long.

[Eisenstein]

You can do that with a nanoVNA, except for the differential part. Less than $100.