Adding an aux/ 3.5mm port to a 2020 Tacoma w/ factory (JBL) HU?

I feel like from all my searching I know the answer already, but I'm curious if it's possible to add maybe the combo USB/ aux switch that I believe is in 2019 and earlier Tacoma's, into my dash and HU? Does entune make this impossible? I was gonna get a little portable DAC/ hifi audio device that has Bluetooth enhancement also, and can work in a vehicle. But goes BT from phone to device, to 3.5mm aux port in vehicle. Any ideas are appreciated, thx

 

Hey OP—did you ever find a feasible solution? I am also looking to add a usb/aux combo adapter to my head unit inputs in my 2023 Tacoma. Tried ordering an older one online and it didn’t fit; I can’t seem to find anything online. Any luck?