The factory method was a restriction off the regulated side of the pump. Similar to certain 440 and 426 cars, and mid-late 80's 318s that used a vapor separator style fuel filter. That's the least expensive way of doing it and it works well.

The more expensive way to do it is to use a real, live return regulator such as this one and run the return line from that point.
If you want 100% of the pump volume to be available at all times, this is the only way to fly. With this regulator the return line would be the same size as the regulated line.

If you don't mind a tiny percentage of volume being lost due to the return and need to do it on the cheap, the vapor separator type filter works fine.

Actually, even a T fitting on the regulated side (or on the output side if there is no regulator in the system) with a restrictor in the return line works pretty darn well and is very low buck.
I used that setup many years ago with a carter 4594 electric pump...3/8" regulated, 1/4" return, with an .080" restrictor in the return line, and no regulator at all.
Nowadays I prefer the fancier return regulator, and feel it's a better way to do it....but there are other ways to get the job done.