For a game, in y'all's estimation what SLDF gear might Niops have had access to? Everything that's confirmed, plus whatever y'all think they could have had (feel free to state your thought on how (un)likely a certain possible design is).
Confirmed: Black Knight, Highlander, Burke, Nighthawk XXI and XXII.
Theorized: I can't find my PDF for Field Manual SLDF, but
Niopsian pointed out the link between Niops and the XXXIV Corps. Look at what part of the XXXIV that Van Coevorden was part/in command of, and use that as a starting point.
According to the SLSB, the 187th Royal Striker Regiment was part of the XXXIV Corps, and could have been a source of Royal units, including the Nighthawk. The SLSB also lists the 187th as having originally been part of the FWL Region (which Niops was on the border with), and having been moved to "an undisclosed area of the Periphery" during the Periphery Uprising. Note also that the 9999th Mechanized Infantry Regiment was the only part of the XXXIV Corps described as surviving through Operation Liberation.
Keeping that in mind, not every single person needs to die in a unit for the unit to be destroyed/disbanded. It's entirely possible that survivors from the XXXIV ended up deciding that moving to Niops, taking their military hardware with them, was better than Exodus or serving a House Lord. Hell, Kerensky would have probably preferred that they do that than serve a House - at least Niops was "family", so to speak.
The next spot I'd look would be Era Report 2750, at the RATs for the Star League/Terran Hegemony. Another possible source of gear was the Star League Expeditionary Brigade, which was disbanded after Simon Cameron's death and not reformed. I could see some of their personnel and gear kicked towards colonies like Niops, especially as the brigade had attached non-combatant astronomy and geology teams. Sadly, it wouldn't include the SLS Pioneer.