HolyKeebs just announced their new keyboards with integrated trackpoints: https://holykeebs.com/pages/trackpoint . Something they do that is really cool is build them into the microcontroller itself, so if your board has the microcontroller in a convenient place, you can add the trackpoint straight to an existing device (already sell it for pimoroni trackballs, trackpoint in Q3). I have a Corne from him with the pimoroni, and I enjoy it, but the pimoroni is not a full mouse replacement for me.

Not sure about your timeline, but the Naha Create is currently on Kickstarter, and I think might satisfy all these requirements: https://www.kickstarter.com/projects/naya-create/naya-create

In general, I’m not sure how easy it is to have multiple pointing devices? For the example you give of a coarse and fine pointing, the most common solution is to have keys that switch between coarse and fine pointing on a single trackball. I’m not sure if QMK can support two pointing devices at once (without significant customization).

For single pointing devices, I’d check https://bastardkb.com/ . They are also very slick devices, but can get pricy.