Support build - PoE2

I am thinking about a "support" build in PoE 2, based around presence. I already know that "Allies in your presence..." works on party members, so here is the real question:

There are gloves that give this bonus - "Enemies killed by anyone in your Presence count as being killed by you instead", as far as i know the bonus Rarity of items found works for the player making the killing blow, so basically with those gloves my party members, ones in my presence at least, do not need Rarity of items found bonuses at all, it's enought that i stack lots of it, right?

Also - does being in a group and doing maps together affect loot in any way? Would we get more items/better chance for rare items when playing together?

Have anyone tried a support buld i PoE2?

The build I am thinking about:
Weapon: a scepter with stacked "Allies in your presence bonuses..." (Or sacred flame shrine scepter)
Offhand: Shield for cheap defensive stats
Helmet: Defensive stats + Rarity of items
Body Armour: Enemies in you presence have lightning resistance equal to yours (would be great with the scepter i think)
Boots: Defensive stats + rarity of items
Gloves: Enemies killed by anyone in your Presence count as being killed by you instead
Belt: Either defensive stats or "Enemies in your Presence are Blinded,
Enemies in your Presence gain Critical Weakness every second"
Rings and amulet: defensive + rarity of items

Also - which class would be best for it and why? I was thinking warrior just for the easy to get defensive stats in passive tree

https://www.youtube.com/watch?v=Det8LG6aBoc&ab_channel=Snap

well crafted builds around that