Militia
By giving cultists some basic training, we can get them to do amazing things, like looking down a gun's sights, taking cover when someone shoots at them, attempt suppressing fire and covering their allies, spread out their fire against things that don't require concentrated fire to bring down, recognise the difference between soft and hard cover and recognise that pretty much everything is the former so don't stay in one place, and generally behave vaguely like soldiers with hints of competence and a survival agenda rather than a clueless gang of hooting thugs looking to prove themselves.
Just occurred to me that Militia would probably also include any cult members who are from the PDF. This might or might not be worth mentioning in the proposal description.
Now, votewise, I'm deliberating between Militia, Flak Armour, Stubber Buggies, and seeking Alpha Legion support. Any two of these would be decent choices: Militia + Flak would give use infantry who are approaching PDF level of skill and equipment (Not necessarily a high bar, but it
is the most basic tier of soldiery in the Imperium); Militia or Flak + Buggies would give us semi-competent or more durable grunts, and either way a combat vehicle to support them; Alpha Legion could provide opportunities for many different things (Tech and otherwise), but I think guaranteed would be another variety of Elite squad, and would probably be most useful combined with the more effective human soldiers that Militia would give us.
We should definitely armor the goliaths.
Also, we should further improve our sergeants.
Pretty sure both of these would be revisions, unless you're think of something really drastic for our Sergeants.