You could use an electric pump but the AC pump will be easy to get parts for, they are very common.. The only thing you need touch on the minimec pump is the bleed screws, you need to hand prime to these before you attempt to start the engine, they arent self bleeding and you need to be able to hand pump clean fuel out of the bleed screws before attempting to bleed to the injectors or start the engine.
Most likely the problem is sh1t or a split pipe, with any luck, the primary filter gauze in the glass bowl on my york used to block with alarming regularity even though the tank was clean.
The bleed screws on the pump are the 1/2 inch head ones on the pump head below the injector pipes, the ones on the filter head is the one on the top that dont hold the filter on!
tha fact that the filters are empty suggests that there is a blockage, even with a failed lift pump a mimnimec pump will usually lift the fuel once its bled, (but once air is i the pipe thats it)the chances of there being a fault with the inline pump are very small.
if you are systematic and start at the tank,check all the pipework, clean out the gauzes, change the filters and thoroughly bleed by hand to get air free fuel from the filter head and inline pump, with the excess fuel button in the injector pipes should bleed themselves after a few 10 second blasts on the starter. if not undo the injectoer end ad crank until the fuel comes out there too.
When i had the transit with the york many times i had to stop on the side of the road to remove the glass bowl and clean the gauze, by the time i drove off there was usually a small enviromental disaster left on the layby floor
BLEED THOROUGHLY AND SYSTEMATICALY and it will go again

and have a bucket to catch the pumped out diesel there could be a lot come out until its air free.