Cut a slit (groove) in a small straight piece of PVC to match the side of the sump, so it will "hang" on the sump. Put a "T" on that PVC and plumb your drain line in to the "T". You can then put another piece of straight PVC on the bottom of the "T" to get the drain under the water line if desired for noise. Obviously use the size PVC to match your drain line. Although it won't necessarily be pretty, it will be cheap, a DIY project and you probably have the material laying around the house anyway.