I found this thread that relates
For the button, I've got one of these on order to try out for fitment etc. I recently purchased a 2nd hand and old gen HOTAS that needs a bunch of buttons swapped out across both the throttle and stick.
I've already replaced the old-style slew with one of these from Aliexpress, rather than the more expensive DeltaSim version. I'm in Aus and the shipping was the most prohibitive part.