It might help, but I don’t think it would be a permanent solution. In men Kegel’s exercise compresses the bulbocavernosus (also, and more correctly, called the bulbospongiosus) muscle. This muscle surrounds the bulb of the penis which is the other end of the tube (corpus spongiosum or CS) between the glans and the bulb. Compressing the bulb transmits pressure through the blood in the CS to the glans making it larger. This happens automatically at ejaculation.
Note, however, that the erectile tissue of the glans is not surrounded by a tunica. It does expand with increased pressure, but returns to its original size when the pressure is released. Some, very few actually, have claimed to make the glans larger. It’s very difficult to do because of the elastic nature of the glans. Even during a normal erection making the glans larger with a kegel is only a temporary measure, in my opinion.