The RC51 oiling system is pretty advanced and optimized for racing.
They have separate circuits for the main and rod bearings.
For the rod bearings, they used the centrifugal force of the spinning crank to boost oil pressure, thereby allowing a smaller oil pump that requires less power.
The only chain in the engine is the small one that runs the oil pump. Everything else is gear drive.
Some smart engineers at Honda.
As for use with a turbo, I can't help you there.
That's way off the beaten track for this engine.