Neutrik, specifically the ones with chuck-type strain relief. The crimp style that switchcraft use, I've had the cable pull out of. It wasn't a switchcraft BUT it didn't look like the issue was the metal flexing, just that style not being able to grip. Neutrik's strain relief, on the other hand...
It's available...
Here for the tan of (neo)soul: https://porkbun.com/checkout/search?prb=247c0147a9&q=the-rig-page.com&tlds=&idnLanguage=&search=search&csrf_pb=30f10dafd174d3a3b77986cc6bf8bdbf
I like mine, it's a titanium version of the Dunlop 420 Flow. I had it made by Otto at OHM picks, I'd recommend checking him out, mine didn't have any scratchiness that I recall, he does a good shop smoothing over edges. They don't last forever though, titanium against steel strings means the...
That sounds like my Traynor YCV80. One of the channels was much quieter than it should have been. Turns out a component broke off the board, breaking the signal path, so all I was hearing was bleed from the other channel.
If the goal was just "flexible silent-stage rig," then yes a Kemper would be near the top of options if it feels as good as I hear it does. However a couple other reasons pushed me away from it and modelers in general for the gig. Without waxing eloquent (unless you ask for wax), it boils down...