That's what I did. All my issues are now resolved or, in one case, 'worked around' (I'm talking the hdmi->hdmi bug, the workaround being usb-c -> displayport in my case). Both my machines are now on 10.15.2 and everything's working great.
I'm a non native English reader... so perhaps I didn't get the meaning of your post:
You have a mac with a faulty HDMI out, you lose one of the precious USB-C plugs... but "everything's working great".
Well... perhaps you mean "working great" the same as when you use the "emergency substitute wheel" in a car; yes, the car runs fine, but...