I had a dualsense before, bought it thinking of those features. Turns out that a few games had support for it on PC, and most were shooters so I wouldn’t play using a controller.
The battery was abysmal too, it would barely last 4 hours. I’ve heard on some places that it was due to the touchpad being polled for input all the time, draining the battery.
Moved over to a 8bitdo ultimate Bluetooth with Hall sticks and couldn’t be happier
Have you tried HeliBoard? I think it has the best multilingual support for all these FOSS keyboards, but mind you, you have to manually load the dictionaries for the languages you want, and same thing for the swipe libraries, but it’s all documented and linked on the GitHub page.