I have good news and bad news. DVD slot is powered by SATA underneath, its general storage port/protocol, and even if you had USB connector inside, it would accept pendrives and nothing else.
BUT you might want usb hub like this one:
https://www.amazon.com/Anker-Extend...qid=1628237184&sprefix=usb+hub,aps,440&sr=8-1
which will take 1 port and give you up to 10 devices on it.
Tell us what device is it exactly, MAYBE you can convert your gpu (it runs on pcie x2 or x4) and insert extension card there, route cables though vent ports and have frankenstained usb-C slot for whole new dock.
Thing look like this...