Prying with a scope probe?
I think the closest commercial product might be the tube-era probes that were made more for the scale you appear to be working at. For example the Tektronix P6006 (see attached picture with all accessories). Obviously these are only available used. You might have to buy accessories separately. Note that the fat tip is on a flexible, rubber boot.
Other than that I'd look at the industrial scope probes, but I looked at the Staubli IsoProbe series, but they are not especially long or sturdy. Generally oxide-puncturing is considered more important for scope probes than prying. Another option might be a high voltage differential probe, which will generally have 4mm banana plugs as inputs, so you can use your favorite 4mm accessories. Due to their lower input capacitance they should be slightly less sensitive to having extra inductance in front of them than passive probes.
Yes I have a P6006 HP Equivalent actually, I want like a thinner version that's threaded. I wonder if they made a improvement with modern plastics?
I have only of one of the tips, maybe the solution is to acquire the other tips. I don't have any tips I don't think, I think someone just wedged a aligator clip on it , I never used it, its kind of similar to the fluke scope meter probes. Been meaning to do something with that now that I think about it. It needs a penetrator tip. It would be the best scope probe to perform a modification on. I don't need to worry about the center pin on that one. I got it in a eBay accessories lot maybe 10 years ago.
I had it in the back of my mind but it looks like it might be the best solution, it looks like engineering went in a different direction.
"the pool que"
Only problem i recall is that the cable might be a little bit stiff. Has anyone ever replaced it? Need to research scope cable replacements.
I think that looking into the older probes will be the best thing. The RG stick thing is a OK idea but the problem is the center pin is still really weak.