Franky can upgrade Usopp's, who in turn can upgrade Nami's.
Brook, Robin, and Chopper are all DF users so we may see their Awakenings.
Ok, a few points:
1.- Upgrading ussop's weapon isn't near enough. He is a sniper... we have seen gun users in this series, they too are haki users, and in some cases particularly skilled at that. Izo is using guns effectively against kaido, beckham stopped kizaru by merely pointing a gun at him.... A fancier weapon would without a doubt help ussop but it alone won't bridge the gap between him and new world top players. his homologues in other crews are likely to be insanely skilled haki users and ussop is literally years away from that. The gang had two years to train and over that time luffy only mastered the basic forms of haki along with hardening. Zoro got the basic forms of haki, armament and projection... Sanji got the basics of armament, no hardening and maybe some capacity to peek into the future (and that's a very soft maybe).
2.- There is a case to be made that nami can potentially carry herself with merely upgraded weapons. She pretty much throws natural disasters at people at this point and if she manages to keep zeus in the future then she can hit way above her tier so to speak. She could aspire to be a sort of glass cannon with tech alone. Though she will be in constant peril against homologues in yonko crews. Add to that her lacking the capacity to protect her own weapon with haki.
3.- awakenings are not going to bridge the gap between the strawhats and new world top players. Awakenings are useful of course but... just that. What makes them dangerous is the skill behind the users. Add to that brook, robin and chopper relying on physical combat and their own martial arts... They can't rely on tech improvements either. Basically, for their awakenings to matter they would have to be way stronger than they are now anyways. Otherwise they are just weak people with awakenings. Add to that them like ussop being literal years away from any degree of competency with haki. Unless they master it way faster than luffy, zoro or sanji...