Do take a look at this picture, count the iggies...
I have blogged about this before, but there is room in the game, IMHO, for alternate configurations for Iggies. The obvious one of these is based on what you can wring out of the system in DoW. So there is no limit on the number of infantry squads; in your troops choice you go nuts on the number of infantry units here, but bear in mind that you'll have two troops choices and have to cram in everything else so the defining limit, rather than 2 to 5 squads, is the number of points you're going to splurge.
Out with the boring ol' officer and four redshirts. Your new command squad is an officer (obviously in 5Ed he's there to dish out orders), two Kasarkin/Stormtroopers, a priest, a commissar and a psyker. To replicate the DoW feel, the officer should also have an auspex and the Master of Ordanance's ability to call for fire. Keeping it DoW, this would be your HQ choice and you wouldn't need a PCS for the platoon of rifle squads - you could rationalise this in-universe by holding up the generous helping of advisors for the squads. Of course you could be a bit more Tactica Imperialis and pick a PCS for the platoon, but your opponent might then require you to forgo the advisors. Because broken.
The squad has fourteen bodies: three of which can be armed with special weapons. And of course there's a sergeant. These fourteen man squads cannot take Hvy Wpns, but can take one 'advisor' who will actually take command of the squad, with the sergeant only taking charge if the advisor is killed. It's possibly worth upgrading the sergeant with a power weapon (again, a late game DoW upgrade is 'power bayonets' for the whole army) if you're expecting heavily armoured opponents.
So we have a squad with a Stormtrooper
And this one has a Preist.
And this squad has a Pskyer (He already knows what you want).
This one has another commissar ("Follow me and obey !").
Addionally there are three elite choices, all 0 to 1. A vindicare assassin, a mob of Ogryn and a squad of stormtroopers. I'd pick a priest for the Ogryn for that extra punch on the charge and a commissar for the stormtroopers for a power fist.
Heavy Wpns teams would individually also be troops choices, but that's a single team as a choice. So with six troops choices you could have a platoon and five HW teams. They're all separate choices so there's no need for unit coherence there, they can be scattered where you like.
DoW has chimera that can take three squads. But let's not go there. One might apply the DoW limits for the numbers of vehicles (max of two Leman Russ, one Baneblade), but the normal points cost of vehicles is probably control enough for game balance (although I'd love to take a nine hellhound list, te he).
So no conscript blobs, no penal troops, no veterans and a paucity of officers issuing orders. IDK how this would actually play. but interesting to consider vs the other thought exercise.