I like the idea of using a hand-operated oiler as pressure pump. I feel I
must warn fellow listmembers of one thing, correct me if I'm wrong...
*Never contaminate a brake system with oil.* The oil will eat up the rubber
seals.
Therefore, use a new oiler for this operation. But you all knew this, right?

In my attempts to make a pressure bleeder on the cheap, I have developed a
way to allow pressurized fluid to be pumped into the brake fluid reservour:

Take a spare cap for the brake fluid reservoir and install a modifed
replacement Presta valve into the center of it, using pieces of a bicycle
tube for gaskets.
Modify the Presta valve by cutting off the inside valve stem and removing
it, leaving just the threaded outer body. That makes a proper place to
attach the tube from the hand oiler.

Know of any other ways to achieve this? Replacement Presta valves may be
hard to find anymore.

OK, what is this Presta valve, you ask ? "Racer" bicycle tubes have this
style valve stem, vs. the Schrader style always used on automobile tires.
The replacement valves have threaded outer bodies, and a flange at the
bottom. Used to repair a tube with a damaged unit.

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Antaki
 My mind is like a steel trap - rusty, and illegal in 37 states.