Chopper and Brook: yes but extreme difficulty.
Nami: no.
Nami has Zeus now which is cool but we saw a severely injured Ulti easily dodge, however Ulti just jumped upward & thats what did her in + big mom doing 99% of the work.
If Ulti is 100% healthy & she fought Nami + Zeus I believe she'd take a few of those lightning hits & be fine. The issue however is Nami being fragile as cheap glass.
Nami got off screened & we find out that the only reason Usopp was paired up with her is so Oda can have him take the hits since Nami went down after only one strike. Funny we don't even see Nami get hurt, she's just down and bleeding.
We've seen Ulti zip around in high speed to attack the dog, she could wait for Nami to use Zeus and just zip past them to get to Nami.
Only thing is you can beat Nami, but Zeus will still fight because he doesn't even need Nami to control him. Nami literally doesn't even have to fight anymore, she can just sit there & not move a muscle
So Nami will lose but Zeus will get the win even if she does down, which then means Nami gets the win by association.
I like Nami but I believe post timeskip Nami simply isn't capable of beating someone of her own efforts, that's why oda gave her a partner.
I'm not trying to bash Nami but she ultimately just can't do anything on her own.