40 or 42 teeth chainring for Shimano Deore XT M8000

[ODC]

Have bought myself a BMC teamelite with DI2 XT M8000.
With the bike came a crankset with 36/26 chainring. This is to small for me. I almost rode the whole time on the 10th or 11 teeth.
Now I know that there is a 38/28 option with Shimano but I would prefer a 40 or 42 teeth chainring.
Not necessary that it is double a single is also good for me.
NO TRIPLE!

Someone nows a solution?