I never thought about rolling my own 3.5mm cable with right angle plugs - might be the answer to getting things sorted in the car
If it's anything similar to my car, it is the only option.
In my Mazda the 3.5mm jack is neatly hidden away inside the driver's armrest/storage bin, but it's mounted so close to the top that when you close the armrest "lid" there is just about no clearance for anything but a right angle terminated cable.
The Neutrik NTP3RC-B plug I chose is both high quality and also really small/low profile, however in most cases the even sturdier Switchcraft 35HD Series right angle plug could be substituted, if using a larger gauge of wire for instance, and the Switchcraft plug is even easier than the Neutrik is to solder/assemble.
And now, back to our regularly scheduled Bluetooth speaker programming, with our sincere apologies to the OP (oh wait... that's me).