Aux and USB ports with new head unit, and backup camera issue

Hey all,

I just replaced the head unit in my 2012 Prius v Three with a 9" Pioneer DMH-WT3800NEX. The Android Auto, Bluetooth, car settings, radio, etc. are all working flawlessly. The USB port also works, still.
I did this using the recommended install kit on Crutchfield. All done with harnesses; didn't splice a single wire. (And thank goodness.)

However, I have a few remaining issues.

1. My backup camera isn't working. I didn't yet just try to plug the camera into the "2nd camera input" port rather than the "rear camera input" plug, but I'd rather ask if that's the right move before I take apart the dash to try that, since it's a pain in the nice person to disconnect everything.

2-3. These are more aesthetic than truly practical questions, but I thought I'd ask...

2. I hate that the AUX port no longer works while the USB does. I still want access to an aux port. Now, for a solution, I know I could remove one of the blank panels and leave a 3.5mm extension dangling while connected to the harness, but I'd love a matching pass-through port. Does anyone know of one of those?
B0BZD5KX48
^can't paste link, search that on Amazon
That has the matching front panel look I want with a dust cover, but the back is the OEM connector type. I just want 3.5mm front and back for a clean look. Crutchfield claims the kit doesn't include any provision for the aux port to work.

3. It would also be nice if I could replace the existing USB port with just a USB port, rather than being stuck with a now-forever-dead aux port. Is there a standalone matching USB port design? Most of my searches are coming up with 12v adapters.

Thanks in advance. Want to get this to 100% before I recycle the boxes and packing materials from the install.

 

Well, seeing as I can't delete this, I'll speak what I learned.

Backup camera was a singular connection with the harnesses I missed.

2-3 appear hopeless. Looks like I'm using the OEM USB port and then I pulled out the blank piece to look an aux cord extension from behind the head unit into the cabin.

 

With the system fully running now, all I have left is to see how I can clean up the GPS antenna cord...it's definitely not a clean look coming across the right side of the dash, but I definitely don't want to go through the hassle of lifting up the entire top of the dash. Don't know if there's any alternatives, though.

I'm also considering adding a compact subwoofer under the passenger seat, but I do not know what the easiest way to mount it would be. I don't want to drill through the floor, in case I'm not the final owner of this car.

 

No drilling? It doesn't shake around, or move during hard turns?