Thukker already have:

Jaguar
Nomad
Vagabond
Panther

I think this is worth considering/tweaking but a good idea at least.

Maybe thukker should stay as it is and the pirate faction could be based on the krusual tribe?

"The Krusual tribe is sly and cunning, shrouding its ways in lies and secrecy. It is isolationist by nature, but lately it's been becoming more and more involved with the power politics of the Republic, staking a claim for its mastery"

Reads like a decent foundation for a technical alliance with a Caldari MegaCorp.

Not sure if ships are OP at all, that stuff can all be tweaked to work properly.

Lets get it done, those EOM ships are excellent

@OP

"Should" I don't know if it's the appropriate word but for the main point, being the interest or not, I'd say yes for many reasons including older players new goals and entertaining.

Now for ships bonus and stats it's a bit too earlier to talk about but the main traits or specifics I'd mostly agree.

I say no.
Basically it's a good idea but you have to think about how and in which way CCP delivers its content. Half-baked. Let's have a look at the drone regions and rogue drones as "faction". They're in dire state. This region is crappier than ever, lost its special attribute (alloys), exploration is horrible, loot is awful and the newly introduced officer mods are just 'meh'. "Woah look a meta lvl 14 drone link augmentor ... cool ... erm not".
CCP could have introduced rogue drone faction ships - like an infested Domi with tentacles floating around the hull instead of the current Federation Navy Camo Potato. Or a faction Myrmidon. Or new cruiser/battlecruisers using rogue drone hulls. Some of them look quite sexxxy. Would've been a great and reasonable boost for drone regions. Instead they go for boring uniform navy drake/brutix/harby/cane. Integrated/augmented/navy drones are mostly crap as well or just massively pre nerfed (not that the difference matters).
So a new major pirate faction would require an extended lore, new exploration possibilities and maybe new missions of some sort to carry its new important role. Everything related to rogue drones is still a construction area ... for half a decade now.
CCP isn't even able to "complete" the current factions properly.

Ps. my vote goes to EoM - Equilibrium of Mankind

There are quite a few NPC groups that could use some ships, some even have Sov of regions, but no ships. :P

Non the less, they drop far more plates than shield extenders

But welp, CCP can make Mercenaries flying Machariels, shooting with arty or auto canons drop Tachyons so...

Fleshing out existing factions with ships, modules and space is a good idea- but they should really finish the T1 (and hopefully T2) ship rebalancing first.

If they ever do get around to adding more 'content' focused on these groups, so more freaking space would be neat, EVE is starting to feel small.