I'm on the same boat, but I don't want to use non-stock cables or keep swapping them around especially for the reasons others just mentioned. That's why I really wish I could find a 4.4mm extension cable to not be tethered so closely to the TA. But it seems like almost no one is making them. I've only seen this 3m one by Delock, but they only seem to have dealers in some parts of Europe:
https://www.delock.com/produkt/85798/merkmale.html
So my workaround for now is to use a 4.4mm female to double 3.5mm male adapter, which was advertised for use with a PHA-3, and two simple 3.5mm cables going into the second balanced output of the TA.
On a separate question, I noticed that the Z1R's instruction manual has a warning section specifically about the "Triple Comfort" tips. It mentions specifically that because it was designed to provide better fit and sound isolation, there is a concern that they can also put more strain on your ears, and thus should be inserted and removed with even more care. Are these the "default" type of tips that Sony recommends? All the official stock photos I've seen have the Hybrid tips though.
When I started using the Z1Rs I defaulted to the "Hybrid" tips just because they are more like the conventional tips I'm used to. Maybe we can have a quick show of hands on what type of tips people here are using?