Not without significant consequences. The closer the electron gun is to the phosphor, the lower the incidence angle of the electron beam becomes - think of aimi

Not without significant consequences. The closer the electron gun is to the phosphor, the lower the incidence angle of the electron beam becomes - think of aiming a laser at a card perpendicular to the beam, and gradually rotating the card toward the parallel. The same thing happens to an electron beam hitting an acutely angled screen as to a laser dot hitting an acutely angled card. So you lose power density as the beam spreads out, which both dims the target phosphor dots (as they receive less energy) and causes adjacent dots to light dimly (as they receive energy "smeared" off the target point). To passively counteract this effect, you need to increase the curvature of the screen, which causes pincushion distortion in the resulting image. To actively counter it, you need to vary beam intensity with scan position, but that still doesn't resolve the loss of focus away from center. That can only be fixed by using a narrower beam, so that the incidence angle matters less. Whether that's feasible I don't really know - this is about where my understanding of the relevant physics and electronics plays out, unfortunately. But if it can be done at all, I would intuitively expect the required control and drive electronics to be very expensive to produce, and maybe also needing regular tuning in a way that ordinary CRTs largely avoid.