I am using OoThax to get to homebrew launcher...
i see so that means you are merely relying on your OOTHax to get to Homebrew Launcher then.. in answer to your question, yes it is possible to install Luma.. pls follow the guide on the link i just gave to you.. you would need CFW which the guide will tell you what to do and the things you need to be able to install Homebrew Launcher as a .cia and FBI, etc..etc..