One-Up Components creates a sprocket of 42 teeths able to transform your 11-36 cassette on a one ready for 1×10 mount.
As you can see on the assembly chart, you can adapt your cassette adding the 42T sprocket and removing the 17T to release some space.
key advantage of this system is that you can create a 1×10 drivetrain with 90% of the efficiency of a 1×11 drivetrain for only 100$. The way is that you can keep all the features of your 2×10 drivetrain – cassette, shifter, rear derailleur – you just need to buy the OneUp sprocket and to adapt the lenght of your chain. Click here for more informations