You need to run a kernel which comes with the binder modules. They are not part of Arch Linux's default kernel (linux), thus you need to install a kernel which ships these modules.
From archwiki. I think this is the biggest blocker for supporting it. AFAIK Solus also doesn't ship with binder module and there is no easy way for user to install it except compiling your own kernel. Also the staff (disclaimer: I am not on the staff) have many more bigger fish to fry at this moment than supporting this unfortunately. If someone step up and commited to support this, they can talk to staff on matrix. Cheers!
PS : Please correct me if am wrong. Thanks
