I guess it’ll work given his expectations, all you need to be decent in PvP is links and BC.
You need CC (Cryo/Kino) to be great, but it doesn’t sound like he’s going for that.
The problem is PvE, he’ll be able to kill stuff but he’ll be limited by the cooldowns, mainly JP.
If he’s ok with that, go for it.
The alternative is dropping Wiz3 for Pyro.
He’ll lose Quickcast so RC skills will take longer to cast, but he’ll gain a ton more sustain.
Linking people to Fireballs then using HK is usually a death sentence in PvP unless they have good mdef.
Never underestimate the value of having an object to link stuff to (Fireball, Dirty Pole, Ice Wall, etc), not only does it make things a lot more reliable (trying to get a good JP cast on moving people is HARD) but it can also boost BC damage by the number of objects linked.
Maybe something like WizPyro3Link1RCFF2 and get Agny and a Dandel Gem (only ~5M these days).
I’m no expert in Pyro builds maybe Pyro2Link2 is better, but I doubt you need JP10 in PvP.