I am afraid that I am still planning to do so. Specifically, an exhaust nozzle for my pool. But having already emptied it for the winter, printing for X-mass and having just now set-up my new Plus 4, I am afraid that it will still be a while.
Regarding soft TPU, I myself have not ventured into that territory, but this thread may contain some useful information: How To Print NinjaFlex 85A TPU
To me, it stands to reason that key to printing soft TPU is to print without much of a PTFE from a dedicated holder above the printer and go slow to avoid the filament getting entangled in the Extruder.
There are also dedicated extruders which give filament better guidance close to the extruder gears, but I have not seen something like that for the Bambu’s unfortunately.
Within the last couple of days, there was also an interesting post on multi-material printing. It contained a video by I believe it was Tom Salander in which he compared different Material combinations. His conclusion relating to TPU was that PETG/TPU gives a pretty strong bond. While PLA bonds to itself and very little else.
So while I can not honestly answer your particular questions, I do hope that I was able to give you a few shortcuts to further, hopefully helpful information.