I've baked two pistols that had night sights. One had no problems, but on the other, the epoxy that glues the tritium vial into the sight melted and the vial came 1/2way out of the sight. Noticed this when I took it out of the oven, so I pushed it back in and left it to cool. So far so good - the vial has remained in the sight.
I say go for it.