I wouldn't chop any cables up or anything, nine times out of ten it's not worth your time. I found some on Amazon: https://www.amazon.com/Adapter-Convert-Connector-Support-Compatible/dp/B07GH5KJH2/ref=mp_s_a_1_10
Not sure where you are physically located, but you should be able to get these pretty much anywhere. You can just search up "usb c female to usb micro b male" on the Googs.
I ditched all my micro USB cables and just bought a few of these adapters for the small number of micro-USB devices I still have laying around.
I'm also looking for the same thing. I think this will barely fit. I'm shopping around for something a little smaller to ensure the fit as well, but I think a USB C extension is likely the best bet and you'd just get a USB C magnetic tip.
If you happen to buy something that works, let us know