Wired Apple CarPlay and Loose USB

[nmpuk]

I have a 2019 Toyota Carolla with Wired Apple Car Play. In the past year the carplay connection is regularly disconnecting whenever passing over bumps or if you even slightly touch the USB cable. It’s definitely the USB port as I’ve replaced the cables several times. I’ve seen a lot of posts online about similar issues with Toyota across the net.
 

Looking to replace the USB port I took apart the dash trim where it is fitted to check for part numbers etc. I noticed when taking the trim off that apart from the single USB/Aux socket on the passenger side, there is a second cable that is attached to the plastic trim on the drivers side but not connected to anything. This cable looks like a square grey plastic block with four ports, which I understand from the internet is a Toyota USB port connection. The existing USB port uses a different connection. See images below of the two different connections. 
 

I’m wondering if anyone knows if i can connect a second USB port to this grey four port block and use that to attach a Carlink wireless carplay box and leave the existing port unused. This would allow me to use wireless carplay for this port and leave the other port for infrequently connecting devices. Anybody have any information on this? 

rear of existing USB/Aux port:

 

spare unused cable: 

 

[shhhh]

Hi nmpuk, did you ever find a solution? Keen to know the same thing...