It looks like Rapide has opened the door to some interesting drivetrain modifications. If you have a 10 speed SRAM mountain drivetrain, with an inexpensive part you could upgrade to 11. Without replacing the rear shifter or derailleur. You will have to perform a little surgery to your shifter, but it looks like a fairly simple swap. You’ll also still be limited by the constraints of your current rear derailleur as far as cassette size, but with cassettes like Shimano’s 11 speed XT 11-40 or even 42t, this could lead to some creative gearing…
Offered by South Africa’s Rapide, the company claims the installation of the 11 speed selector wheel takes only 15-25 minutes with only a few simple tools. Available in three versions, there are unique selectors that will fit pre-2014 SRAM X7/X9 10 speed, pre-2014 X0 10 speed, and 2014 or later X7/X9/X0 10 speed shifters. Sold for R199, according to the Google, that works out to just over $12. It will probably cost more to ship it to you than the actual cost of the part.