Buddy, you're scaring me!
I agree with IO, I like Wobbly’s idea, and if you'll permit me the latitude of being adamant, here's why.
You're oiling 4 throws off of the center bearing, 2 off of the front and 2 off of the back. Half of your reciprocating assembly is dependent upon consistent oil volume and pressure to the center main bearing. Any variation in the volume and pressure, particularly to the center main, will give you trouble on the rod bearings.
The girdle obviously stabilized this area, but it's still the weak spot, simply because of the amount of oil the center main needs to deliver. If you ever encounter an oiling issue, I believe that's where it is going to happen. I don't know if you've inspected your caps yet, but if they're good, I would proceed with the assumption that you can't get by with less, rather than speculate that you could get by with a 10% drain down.
I think Wobbly has the best solution, and truth be told, if all an auxiliary oil system needs to do is shower the pin and the underside of the piston, it's not going to require all that big a pump. I'd speculate that you might even see enough hp increase in the cooling effect on the piston to mitigate any additional power drain a small oil pump might draw.
I don't know what kind of volume your oil pump is putting out, and as overbuilt as everything else on this car is, it's likely you have enough oil volume and pressure that my worry is unfounded. But on the other hand, this build is so far off into uncharted waters that my inclination would be to err on the side of caution.
Now STOP SCARING ME!