I think I found a solution. I just got a set of the Bronco AS-90 tracks and they look very close to the new Brad tracks. The width looks right with them being slightly wider than standard Brad tracks, but still within the space of the sponsons.

I thought about sacrificing the track from my Trumpeter AS-90, as I already had built the Accurate Armour one. They look like they'll work, but I'm still digging the K9 track. I'm not down with the notches in the AS-90 track, plus the pitch was slightly different, and I know the pitch is correct with the K9 track.
If the guide horns were correct I might have considered them.

I hear you, but I can't justify sacrificing a K9 just for the tracks. They are close enough for me.

I go to Korea a lot.

Since those Bronco tracks are styrene, you could fill the notches with Evergreen. After sanding down and nicking up, you might not be able to tell, You'd only need to do about 40 links.

I had thought about filling the notches as well. I may just give it a try.