There's a lot of amazing ideas for stat trackers already implemented, I think the best thing to do for the mechanic next is simply make them apply to each weapon type of a weapon. Even if this means making them much more expensive it would be worth it and make them much more enticing to grind.
I would be more likely to grind Gauntlet even if Trackers were 4x more expensive if they worked on every Warpike instead of needing 1 for each Warpike. I don't use only 1 Warpike, and I feel less motivated to use trackers as they're only showing a small fraction of my actual stats. It makes me feel discouraged from the gameplay variety of using different Warpikes if I want to grind out a tracker