A simple solution is not playing any promotional videos on ex-DOH flights, assuming most pax are transit anyways.
Safety video QR can take notes from CX, they can squeeze a bi-lingual vid into 5 mins.
Audio announcement should not override user selected volume (it's at 50% no matter what was chosen at other times), or at the very least, have the crew put the phone further away from their mouth. This I find is an A350/A380 issue, using the Thales IFE. The Panasonic based 777 and 330s are better in this regard.
A switch to all pre-recorded announcement like KA can solve the constant mispronunciation, mumbling PAs and can offer a range of destination based languages. Ex-DOH should have simplified announcements, eliminating the QRPC recruitment etc.
Also, can we not board night departures flights like we're entering a dungeon? Setting the cabin lights to seedy night club mode is not inviting and I've seen far too often YCL pax couldn't find their seats because no one can read the placards. Aircraft cabin should be inviting and relaxing, not dark, dingy and suffocating the mood light is attempting to portray.