He'll awaken his God fruit at God Valley perfectly.
He would definitely spark up extreme chaos especially post awakening catch the attention of Xebec, Rocks Pirates, Garling, Saturn, Roger and his crew, Garp etc.
Various Rocks pirates may try to hunt and kill him for his fruit and once the WG catch wind that Nika is here, all hell will break loose especially once Imu finds out and gets involved directly inevitably.
But I also just realised this is pre TS Luffy so no haki, no gear 4th never mind getting gear 5th...so RIP LOL? Oda would find a way to make him survive, guaranteed. But man, I do wonder what would have happened if Luffy awakened pre TS instead. It almost felt like it could have happened at Impel Down vs Magellan or Marineford especially with Akainu there. Not to mention Crocodile was giving Luffy the Kaido treatment pre TS, that could have forced him to awaken back then but he didn't ofc. Would have been WAY to soon for the story as well, even if it happened at ID or MF instead.
Some scrapped film red plots had luffy going back in time to meet young Shanks but also separately the original user of the nika fruit (so joyboy ofc?) and also one involving a new impel down in the sky with bon clay being saved lol. enel came back in one of the alternative planned plots too. Doflamingo and Crocodile too iirc.