Think the "Karters" are already doing this. Especially the alcohol burners.
Quite easy. They divert the pressure diaphram lift pump that fills the
resevoir in the tank "float level" to the main mixture screw. From there
straight into the carburetor using the existing port. They use the mixture
screw to set the maximum mixture setting and let the rest go. Vacuum does
not pull the fuel in. The system is pressurized. Works quite well for a
racing setup.