I'd forgotten about the 3.5mm audio connector. One could argue, however, that adding a [presumed] XLR adapter in the Sony fashion negates the compactness of the camera as much as an external monitor would. Hopefully the [presumed] XLR unit will be small.
The TASCAM adapters are of similar size (across camera brands), they have two XLR/TRS connectors, one 3.5mm input and output, and digital connections via the hot shoe.
However, what you can do instead is to record audio externally and have a bluetooth timecode generator from Atomos feeding signals into the audio recorded and the camera (Zf, Z8, Z9, ZR at least support this, probably Z6III as well) so the timecode in the audio files matches that in the video files and then syncing becomes easier. No cables or accessories need to be attached to the camera, but of course the external audio needs to be handled somehow, put on stands or a sound person can manage them. One thing that is good about this approach is that you can put the ZR on a gimbal and since the audio is recorded separately there is no noise from the gimbal, and the camera is free to move without cables or microphone being attached.