Would it not be more simpler just to get a new scope probe that is x1/x10 switchable? Does everything for you.
Mike
Usually fixed X10 probes are better than switchable, if you are working up to a few MHz it's fine and practical the switchable ones, of course. Not having the switch means having the 9M resistor physically closer to the tip, so less capacitance loading the DUT and more control over the resulting filter, as usual the 9M needs a cap in parallel, and at some point compensation trimming is needed, but now you can do that at the other end of the probe, and as there isn't a switch anymore the filter can be much more elaborated and precise. Switchable probes are a compromise, and generally speaking using X1 probes is a compromise, for bandwidth and safety, and should only be used when the 10X more gain are required to measure very low level signals (and limited bandwidth).
In this case bjoneson didn't need a probe but banana plugs, I suggested just to add a resistor inside of one and in the case to need extra bandwidth add the proper compensation, and then the various approaches depending on the expected results, just adding the resistors would seriously compromise even for audio range, ~1M impedance of the 9M-1M devider and just 20pF means -3dB @9kHz, and depending on the wire it's likely to have more than 20pF combined with the scope's input capacitance.
JS