I've said this before...For Airbus, there is currently no requirement to use a STCd or TSOd headset. The subject matter was pulled from all documents and the last circular for "approved" headsets is almost 20 years old. From an aircraft point of view, a headset is a consumer of audio signals arriving at the comms jacks in the same way a phone/laptop/tablet charger or vacuum cleaner is a consumer of electrical power from the power sockets. We don't see anyone getting over excited about TSOd electrical devices. A headset is not a permanent fixture and is not going to fry the circuitory.
Do what you need in order to protect your ears. If they want you to use a crappy Telex Airman, kick off and complain to your responsible person for occupational health. This alone will invite a debate and force your Chief Pilot to ask Airbus formally where the reply will be "we don't offer any opinion".