So today I checked the modified 10 amp PS using the connect/disconnect pushbuttons, with my scope hooked up.
I tried several different loads and settings and various scope settings, but did not see any kind of spike, point bounce, or anything else suspicious.
If the PS does have a spike at startup it certainly was not evident, because of course there is no output until you push the connect button, which is always after initial power on. So I am happy that it’s pretty much as safe as it can be. All good.
I may run some similar testing on my Riden unit as well, just for fun.
Rod