I don't know if anyone has ever done it. There are test ports somewhere on the engine that you thread into that might be a possibility. I'd be worried about them vibrating out, so I'd safety wire it or something. If I recall, the 700 runs over 100 PSI of oil pressure.
I'm worried about the motor, and always want to see the oil pressure, but in this case the transmission oil pressure is 100+PSIG. As you say HondaTech, since the motor only needs 20+PSIG, the transmission will indicate the problem first.