Sure. -fstack-check wasn't designed for stack clash protection. It's old and it makes little sense in context, but it works and it exists, which is why it's being used until proper Stack Clash prevention lands in GCC 8.

I don't think signals change anything. You can think of them as just function calls that skip over the redzone, then keep probing. The redzone is < 1 page so you should still wind up touching every page.