Other than RP with Omega what can they explicitly do with RP that no on else can do or that they add specially without it being something that is a gameplay function like negotiations? I am on this point only because in regards to their lore there isn't anything special about them other than they hate mandalorian's and that's about it. So I'm fine with saying that the people in 2ndAC care about RP and may be really good at it but that would be a thing independent of Parjai not because of it.
That is a new model as it may be a reskin it will still take up space because it is still a model and requires textures it would function like the bounty hunter "skins" sure they use the same base model but they are still individual models too and if they need to be compatible with the previous body groups or it would need to have them all added to the reskin. Unless a dev wants to explain that more.
Omega have their nights ops and their lore colours sure do they only really need one set sure but they have lore to support it plus they so little resources go into their squad. Night ops armour for your unit why? why should the 212th in that regard be so special because if you want contextual use armour why shouldn't then everyone else not then request something like that for themselves.
Below is some of the only lore Parjai has and they interaction with Omega and how they feel about the night ops armour
In 21 BBY, the 2nd Airborne Company was stationed aboard the Republic auxiliary ship Core Conveyor, along with the Republic commandos of Omega Squad. The paratroopers resented Omega Squad because of their Mandalorian heritage - the 2nd Airborne had lost many battles to the Mandalorians. They outfitted Omega Squad with jet packs, which led to some disagreements because the commandos had black armor but the jet packs were orange and white.
"Couldn't you at least get us matte-black ones? I don't want to plunge to my doom with uncoordinated accessories. People will talk."
"You'll have white, and like it."
―Fi appeals to Barlex for black winged jet packs
"Nice of you to join us, Omega, and may I be the first to say that you look like a bunch of complete prats?"
―Barlex greets Omega Squad
I have not really found this anywhere within their lore. Sure the page you posted say "elite unit" as a describer but no actual source to what makes them elite in the book they appear in they are just a squad in the 2nd airborne company nothing special. Most lore pages that talk about units call them elite because its a nice descriptive tool I confirmed this with a few people who know that lore better than myself.
To talk about the not necessary point I did not say that at any point although do agree with the sentiment as I want a good justification for it as I am with all suggestions I see that just say add this because I think x thing is just neat. The truth is this body group just plainly isn't necessary and especially if its only use is going to be used for night ops as that just reeks of entitlement.
If you want something then you need to justify it and be honest about why you want it as you don't want these models for the "roleplay" or anything like that its because well they exist and personally you and the 212th think they look neat and thats perfectly fine as a position to have but thats the only real argument for these Ive been trying to point out logistics of adding things blindly and if they do nothing really for RP.
Also if you get these models then the next time the 104th wants something or the Jedi/Sith/CIS/BH want something we then need to give it the same credence as this post I am not trying to be awkward but I am expressing fair scrutiny i feel