One other thing I'd do is drop penal squads. If you're not gonna have Shaefer's insane little army the proper form is a mass wave of meatshields, the IG don't use single squads as distractions they use whole companies.
So, first you detach Conscripts from the Platoon mechanism so you can, if you so wish, fill out your troops section with conscripts.
THEN make them 2 points per model. Finally add things like "Penal troops" or "Mutants" (like Beastmen, for example) as modifiers for the basic unit costed per-model. Muties might be +1S or FNP, Penal Legionaries would be Stubborn (with help from their Collars) or even Fearless.
The precise nature and the cost of such add-ons is neither here or there at the moment, it's just a rough idea, if you like the sound of it I'll neaten it up, if not... I'll shed a tear and soldier on. But yeah, it's the chance to hurl a hundred or so disposable criminals/deformed creatures/dumb civilians at the enemy