peek/poke or other method to write direct into nrf52 registers?

How did you know I would need this feature today? ;-)

var f=require("Flash");

var NFCPINSreg=0x1000120C;

E.setFlags({unsafeFlash:1});
f.write(0xFFFFFFFE, NFCPINSreg)

Does this code seem to be the way to go?