I dunno what nanoUFO is aiming for, but for your use case, can’t do that with dual touchpads alone, then. You’re after a touchpad+gyro. Hmm.
searches a bit
It does look like there is at least one touchpad+gyro input device out there other than the Steam Controller.
https://www.amazon.com/DarkWalker-Controller-PC-Mac-Linux-Unix/dp/B0CM5YXYZM/
That might take some remapping to glue the inputs to a given game, as I bet that it’s presenting itself to the system as a USB hub with an attached keyboard, gamepad, and touchpad.
That gamepad look like an ergonomical nightmare.
I mean I still have my Steam Controller but I wish they’d just rerelease the thing. For the 60 bucks back then it was an absolute bargain considering ehat you can do with it. And I have to say, it felt also really nice to hold with the kinda grip you’d have on it, which is really different.