On my '72-1/2 (#4460), I needed to replace the fuel gauge float assembly.
On my tank, the fuel pick up line is integral to the tank. It is an internally welded in steel tube in the tank, with no access to it for replacement. The tube had rusted through at about 1/2 tank level. That meant for me that if the fuel level went below that "rust hole", the engine would get no fuel.
So on a full tank of gas, the car ran fine. Once the level hit that hole, it would stave the engine.
The current replacement fuel level sender that is available for the Pantera also now includes the fuel tube pick up. So by replacing the sender/pick-up assembly, the original fuel line supply line from the tank became available for a return line.
That is the procedure that I would recommend to you for your current application.
The fuel line supply line will be a simple 3/8" fuel hose about 3" long and the banjo bolt and fitting can stay in place with a simple fuel line hose connection.
That's about as simple and stock looking as you can get.
There will be a "return line port" somewhere in your EFI system to connect to.