Just a couple of warnings here as I've gone down this route too and burned myself a couple of times. Any measurement device will load the circuit in some way. In the case of the probe there, any stray capacitance will drag your IF measurement off and/or reduce the Q of the circuit being measured. This may or may not be an issue but it's worth remembering it.
Since discovering this I tend to adjust IF shape by injecting noise into the front end of the receiver from a noise source and using an audio FFT on my smartphone to shape it. Surprisingly effective!
I am using a clone of the noise source here, without the bridge (everything after C4 removed) to do the job:
https://qrpguys.com/wp-content/uploa...ide_120616.pdf ... this is loosely coupled to the antenna with a bit of wire wrapped around it usually.
On the probe front, your standard scope probe would have 15-20pF of capacitance across it. I would build the probe as is if you want to go down that route.