Specifically, to be used with the Samsung Dex. I'd find the trackball itself useful but primarily I'm after something that can remain stationary/won't require much space, so if anyone wants to suggest an alternative feel free, I'd be more than happy to hear suggestions.
One I've seen that interests me you hold, slightly reminiscent of a VR controller. There appears to be a few being sold by different companies, however, which makes me suspect it's a cheap import bought on Ali Baba or some similar site then rebranded. That said, if it works reasonably well I wouldn't mind. An example: https://www.amazon.co.uk/1000DPI-Wireless-Computer-Trackball-Receiver-Black-Gfun-STM001-Black/dp/B00V3132QO/
Other than that, all I've seen that I think may possibly be compatible is Logitech's Marble Mouse.