I used to use an Accusump on my race car. It's a pneumatic reservoir plumbed into the system. It has a one way valve that can be released with an electrical signal. While the engine is running, it builds pressure. When you want to start, you open the valve, forcing a shot of pressurized oil through the oil galleries. Works great. I haven't looked, but I bet there are plugs on the right side of the block than can be removed to fit it up.

Canton Racing Products

As has been mentioned, just rigging the stop lever to allow manual control will give you the option of cranking for a few seconds before you start. That will build more than enough pressure to prelube. And then again, my 190DT has made it to 340K miles without prelubing.