Type-C doesn't change the actual data across the USB port.
You can do either USB FS or HS data throguh Type-C and that is fine.
You even only have to hook up one half of the D+ and D- lines (the type-C connector has two of each to help with the flipability of the connector) The host side is the one that deals with all of this!
As for all the power delivery and things like that for type-C, in this case as you just need standard 500mA usb power, you only need to put a specific pull down resistor on one of the CC lines. then you just need to hook up vbus and ground.
You can leave all of the rest of the pins like the SuperSpeed pins, SBU etc not connected