Is there a visible way to turn off this Wedgewood pilot light?
No, there is no valve visible here. On this particular model, after further searching, the valve for the broiler pilot turned out to be where the pilot gas line exits the gas distribution manifold, which is under the cooktop, by the broiler control dial. It looks like a a flathead screw. If you're going to then use it by lighting with a match/striker/lighter, then obviously only do this with a broiler or something else that is simple on-off, not something like an oven that has a thermostat.