High voltage measurement

I have questions concerning high-voltage measurement.
The goal is a measuring system to realize that kA for the voltage measurements up to 100 kV, currents up to 2-5 and frequency should be suitable up to 10 MHz.

High voltages and high testing jobs   frequencies again actually Yes Each other talk.
Ever, the less the voltage that could be measured height the frequencies. As the cable length is always less than the wavelength search.
What means, depending on the level the Freuquenz is the smaller the wavelength and the realization of the cable length is so difficult.

You may have an idea how you could solve the problem and how to realize such a suitable measurement system?
What sensors could use the best? Rogowski coils? Fiber optics? normal CT? or an other sensors?
I did little research that currently gives the most sensors on the market, not for high currents up to A few kA / height up zig kV voltages / high frequencies in MHz range are suitable if you do then the measurement error are big.

I thank you in advance and HV electrical Look forward to any further tips and information

Let me guess, it should be then still virtually free of charge and as a man project be realized in a very short time.