I've sourced a discontinued phone model which has passed all initial testing for the ideal candidate for the new base hardware. We do have another suitable phone that is already fully tested, but this other one is even better. We have managed to get timing accuracy to easily within 1ms accuracy, and wireless transmissions are fast and secure.
I've already received 50 units today as they work perfectly with the Lite version computers anyway, so its not like they'll go to waste. But we haven't yet fully tested with the Uber software, although it should be fine. I'll post updates as soon as they rest of the testing is done, which should be monday/tuesday.