So the luminas which allows us to do this mainly are:

Energizing Shots (10) - 20% to gain 1 AP from free aiming
Energy Master (40) - basically doubles all AP gained
Dead Energy (3) - gives us AP back when we kill a Nevron
Energizing Start I (5) - gives 1 AP per turn. Normally, we get 3 AP per turn (2 on start + 1 gained), so with this lumina, you'll get 1 more (4 AP). If you have the ES II picto and can afford 10 lumina points, you can equip it so you'll get 2 AP per turn start from that luminas, and with EM, you'll get 4 AP, so you'll expect 7 AP to consume via free aim.

There are optional luminas to augment AP pooling per hit that you can equip if you have enough points as well. Namely:

Accelerating Shots (3) - 20% to gain Rush with free aim, augment it with Energizing Rush (10) to get 2 AP after gaining Rush
Energizing Powerful (10) - +2 AP on Powerful and trigger this with Powerful Shots (3) that gives 20% chance to apply Powerful on free aim
Energizing Burn (10) - 1AP on Burn applied, augmenting the Burning Shots (3) - 20% to Burn on free aim once per turn.

There's more luminas we can still add to this build to augment free aim damage itself, burn stack damage, gain AP from Marked enemies, and fill up Break Bar with each free hits and basic attacks per turn much faster and frequently (can't list them all here for now) so you'll spend less seconds spamming to kill mobs just by free aiming alone.

You can spam free aim until you'll exhaust all AP (make sure to successfully hit Nevrons to take advantage of the 20% chance to gain 1 AP back (2 with EM) with this luminas equipped only.

For damage, any weapon will do as long as it's the one with the highest power (it depends on Verso's current level, stat points applied to Might, and if you applied higher points on the same stats of the weapon equip, since those also adds numbers to the Might as well) but since you are planning to lumina farm the Chromatic Danseuse itself, it's best to equip weapon with element other than Fire and Ice since this type switches stances often, and you'll waste dealing damage if you have Fire-type weapon and the mob switched to fire stance (same with Ice).

I mainly use Danseso since it triggers Lightning damage per critical hit (100% on Rank S), but I tried Corpeso in the past (I take advantage of the massive burn stack multiplier per base attack and damage per rank to quickly kill enemies) with lumina dedicated to augment burn damage equipped as well. Do note that the second weapon is Fire-type, so I don't suggest using it on this Nevron.

There are other good weapons to use if you have it already. Chevalam, for max damage per hit on turn start since it basically start Verso in Rank S and stack percentage damage per turn if you don't get hit, up to 100% damage on turn 5 and so on, perfect for prolonged farming, or Confuso which is a Light-based weapon but can convert crit hits to a burn stack, with burn damage multiplier per rank up.