I am upgrading my road bike to the new Shimano 9150 Di2 system, and at the same time I am adding a Quarq DZero power meter. My LBS told me that Shimano is not selling chainrings only (you have to get the whole crank set). My only option would be third party chainrings. I could get SRAM Red ETap chainrings with the power meter or another third party option.

My questions are:
Are the SRAM Red ETap chainrings compatible with the Shimano 9150 Di2 drivetrain (shifters/derailleurs/cassette)?
If so, what chain would I use?
If not, what chainrings would you recommend?

Thanks for your help,
Brian