[jimmc101]

Wouldn't the simplest thing be to use a standard 10:1 probe with a 'T' piece at the 'scope end and a shunt 100k resistor and a capacitor as required.
O.K. the probe input resistance would be 9.09M instead of 10M but would this matter?

The problem with any non-lossy coaxial cable is resonances, e.g. a 2m cable will be a quarter wave at about 25 MHz (assuming approx 67% velocity factor)and so would look like a short circuit at the probe end if unterminated at the 'scope end. Add the 'scope input capacity and the resonance would occur at an even lower frequency. For this reason normal probes use resistive inner conductors to damp out resonances.

Jim