Just cut the screen and sound. Who needs that shit?!
Super 8 sound was always horrible, mostly because of the racket of the motor going off right next to the mic.
Put in sync for a sound recorder if need be. Then people can supply their own. Sound recording is cheap and plentiful these days.
If you want to look at a small glare prone, non daylight screen get a digital camera.
Just concentrate on making the best possible film transport in a small serviceable unit and put a good lens on it.
The lens is really very important for whether you are going to get sub VHS quality or near 4K, because of the tiny sliver of celluloid it has to shrink the picture to.
The smalle the sensor the better the lens has to be.