The problem with this idea is that line is your TANK VENT. You need to provide an additional vent of some sort. Some here advocate a vented cap, but that exposes you to gas puking out over the fender under some conditions.
A vapor return is a good idea if you are experiencing vapor lock/ fuel boiling. You don't need a hem filter. Wix Makes them in 5/16 or 3/8 line with a 1/4 return orifice I believe 33040 / 33041 are the numbers