I don't bother with the cable. I've got a small Logitech mouse (Bluetooth) that is made for traveling that fits in the case with the DC. I use it when I need to move files around or manipulate anything that fat fingers might screw up.
Figured bluetooth should work - and I know what you mean about fat fingers on a TSC7 screen
It has a button on top that allows you to switch between three different Bluetooth devices so I can pair it with my laptop and both T7 tablets and only carry one mouse that works with any device needed in the field.
That's cool - do you know the model number? - it sounds like the perfect solution.
@jimcox It's a Logitech MX Anywhere 2 but I believe the new model is the MX Anywhere 3. They both have Bluetooth and I believe they can also use the USB dongles that come with Logitech's non-Bluetooth mice.