I recently saw that some one did that and it ran. Routing around the controller has the same effect. I always thought the timing of the injecters controlled fuel flow, but there must be some reason to control the pressure. If not, 2 less things to go wrong.
I remember an Opel pump being a potential source. Never found out which one, nor bothered as Opel dealers are kind of scarce. Looking at pressure and volumne for your typical US car, it must be an itty bitti thing.