Going nuts trying to find the adapter(s) I need for my car - thought I'd pick the collective brains on here!

Have a streaming / iPhone kit for my Becker headunit. The iPhone connection on the kit is the old 30 pin one (male). I need to connect this to a standard USB cable - also male.
So ideally I need a female 30 pin adapter at one end, going into a female USB adapter at the other. Have seen one listed on aliexpress only, and apart from having to wait 2 months for it to arrive, the stuff on there is normally tat.

Have looked at getting a 30 pin to lightning connector, and then using a female lighting adapter to female USB adapter - but they don't seem to exist.

Anyone have any ideas on an elegant solution??