Not sure how widely know this is but the Bionik Mantis headphones for PSVR fit just fine on the Rift S! : r/oculus
No Frankenquest required - Bionik Mantis $42 : r/OculusQuest
Mike VRO on Twitter: "It doesn't look pretty but the Rift S sounds 100x better now 👌🏻 These are Bionik Mantis headphones designed for PSVR. This will do the trick until I
Amazon.com: Bionik Mantis Attachable VR Headphones: Compatible with PlayStation VR, Adjustable Design, Connects Directly to PSVR, Hi-Fi Sound, Sleek Design, Easy Installation : Video Games
Bionik Mantis Premium Clip-on On-Ear Headphones for PlayStation VR 845620090075 | eBay
Bionik Mantis Clip-on Headphones + Over-Ear Pads for Playstation VR 714983531955 | eBay
Bionik Mantis Premium Clip-on On-Ear Headphones for PlayStation VR : Cell Phones & Accessories - Amazon.com
Soft replacement over-ear pads for Mantis
Bionik Over-Ear Pads - Replacement Pads for Mantis Detachable Headset for Playstation VR
Using The Bionik Mantis With The Oculus Quest 2 - YouTube
Bionik Mantis PS VR Headphone Review -- Comfort and Convenience
Bionik Mantis originally for PSVR clips on flawlessly.. : r/OculusQuest
Bionik Mantis and Elite Strap - no mods needed : r/OculusQuest
Bionik Mantis Premium Clip-on On-Ear Headphones for PlayStation VR BNK-9007 845620090075 | eBay
Bionik Over-Ear Pads Replacement for Mantis Headphones for Playstation VR NEW! 845620090266 | eBay
Oculus Rift S + Bionik Mantis VR Headphones? - YouTube
Bionik Mantis Premium Clip-on On-Ear Headphones for PlayStation VR 845620090075 | eBay
Bionik Plans Mantis VR Headphones For Quest 2 This Summer