Replacement For Nakamichi Stereo W/ Bluetooth/aux?

Hey everybody, New to the forums - what an incredible community! I'm looking to replace the factory stereo (Nakamichi, 6-disc changer) in my LS400 with something modern, most importantly with an Auxiliary input or Bluetooth functionality. I've done a bit of research online, and it seems like most units (such as the Pioneer AVH-P3400BH) either don't fit, or won't interface with the disc-changer or amp. Does anyone have a suggestion for this? I listen to a lot of podcasts and music via my iPh

There is not much to see in these photos but they show the small on/off button that Factory Radio Service added to the face of my 00 LS Nakamichi next to the Fader control and the 3.5mm aux port added to the back of the radio with a cord attached to it. Workmanship of the added switch and aux port is flawless and the sound quality is excellent. The radio must be in FM1 or FM2 mode before the aux switch works. Yep, the first photo shows streaming from Pandora to my Nakamichi system. I found t