In theory it should work; should be cheap enough to try. The health department might frown if they found out, as around here that would be a "cross connection". You may find, if you do a good job with the pvc (ie...install the right screen in the right place, and develop it correctly)..you'll get way more water than the dug well. I'm a mud rotatry driller, and more as an experiment, I've been installing some replacement shallow wells. I drill, screen, and grout the well just like it was a normal deep well in inconsolidated formations....but just do it in the shallow well aquifer. That's anywhere from 20-50' here. In every case, I've gotten at least 3 times the sustainable flow as the adjacent dug well.