It could work, use at least 1 inch PVC to get adequate flow to the sump. If you use a UGJ return on the pump don't forget to either have a check valve, or a hole drilled near the top of the return of sufficient size that during a power outage you don't empty the tank into the sump. Have the overflow end in the sump underwater to further reduce CO2 out gassing.
You might discover this on your own but if you take a PVC cap and drill a small hole in it (1/8 inch works) and put it on the top of the open T to the sump you create a muffler that reduces the sound of falling water. When we had the sump demo for our club I took the mufflers off the three pipes I have on my 56 and the sound was loud enough you couldn't hear anyone talk. Put the mufflers back on and .... silence.
Don't glue the pipe together until after you've tested the flow. You might find that you have to lower the upper cross section to get enough draw through the pipe. Extend the open T about 2 inches above the top of the tank if you have a canopy to hide it, if it's open top how far you go up is up to you, but, it will want to spill some water from there every now and again and the extension helps fend that off.
Don't forget, fill the tank, let it drain to the sump with the pump off, then fill the sump, and you are at maximum capacity. Put a ball valve on the return from the pump and use that to control the upper level of water in the aquarium.
Funny story, my 75 is set up with a sump. I came home from a week away and I thought the tank looks a little full, and while I'm standing there some water started to run out of the tank. So I pull the plug on the pump and the overflow stops. I mop up half a cup of water, start the pump up again, check the overflows, can't find a problem, and everything is running fine since. I think the tank was mad no one was looking at it for a week, it just had to make a statement.