Got a lathe?
You can always just make yourself a pump.
Or adapt a pump that is available.
Heck, I HAD a SB Shaper that I gave away, never really looked it over. But there are only so many reliable ways to run an oil pump.
A reciprocating plunger pump is just a piston and cylinder, a couple of check valves (bearing balls, with a spring to help them seat) and a pick up and outlet tube.
The pictures I see online show a pretty basic unit, not too hard to fake together out of bar stock with some soldering or a little fakery with some small screws or bolts.