I agree with the sibling comment. There's no real alternative to the trackpoint. Nothing comes close, but the initial hour or so of using it is weird ; frankly, I don't remember it because I did it about 20 years or so ago, but everywhere I've worked, I've made sure to buy a keyboard with a trackpoint.

Currently I'm using the Tex shinobi keyboard, and before that I used the IBM USB keyboard with the X220 layout.

When navigating with the mouse on the web, I currently have my thumb for the mouse buttons, my index finger on the trackpoint, and middle, ring, and index for movement on the HJKL keys. Nothing beats that for speed and hand movement a mouse is a little more accurate, but I'm willing to trade that for not moving my hand all the time. (I also just realized I switch hands a lot for moving the mouse - not something you can do with a mouse.)