So I brought the friction ring to the garage. They are certain the sound comes from between the outer brake disc and the wheel, instead of between the inner brake disc and wheel bearing flange. So they installed the friction plate between the outer brake disc and the wheel and the sound has dissappeared! Very strange but there's no more annoying ticking noise so I'm happy.
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2014 BMW M235i auto. JB4 & EWG connector + BMS BEF (EWG Race 10 map) + BMS WMI kit (dual BM5 nozzles, 80% meth mix, Boost additive 50, Scaling 60, min flow boost 6.5psi), 98 RON/93 oct pump gas, intake, ER CP, Forge BOV, Wagner Evo II competition intercooler, ER kitty-less DP, eisenmann exhaust, quaife LSD