Hey, I am looking for the same adapter. (bit late this reaction) But: The old 30-pin connectors use a fire wire protocol to charge. The new 30-pin connectors use a usb protocol to charge. Old accessoires (like my car) are only capable of charging whit the firewire protocol. Where the new accessories are capable of charging using both, the usb and the firewire protocol.
Radtech had sold these adapters, bit these are out of stock now.
https://www.radtech.com/products/cablejive-dockstubz-30pin-firewire-adapter
B.t.w. These things, the culture and the dumb people (like you) are the reason that my iPod touch was the first and last Apple product that i bought.
(typing on a Lumia 950 and using a Dell laptop)