If the ASK had a trackpad that worked as well as the one on your MBP and simply made a cursor appear when you touched it with which you could do the things you currently have to do with your index finger, would you use it or perpetually ignore its presence?
If Apple does support a system-wide cursor, it will probably be through a trackpad on the Smart Keyboard, as you suggest. It would support all the usual multi touch gestures, and the cursor would probably look like a translucent dot, rather than an arrow. Not sure if the trackpad needs to be able to click. Probably not.
When using the keyboard I would definitely use the trackpad. It’s less energy.