Making them available earlier means adjusting their stats. Their 4X Kar98's alone have really good performance(don't know numbers, but just watch them in cheatmod), and just touching/shuffeling their veterancy/RA isn't enough.
This is the sort of change that would require a lot of experimenting, which is also the reason it is unlikely to happen. It would only happen if we get a major patch with several weeks of modded testing by the community. I'd probably support it.
Here, I grabbed some graphs for comparisons vs IS and USF rifles. Not pretty to fight against. Of course this doesn't take into account the 0.7 model size or the squad sizes.
EDIT: Nor does it account for the likely LMG/vet comparisons on the field.
As for the OP, I don't agree with moving them so early on. Even with adjusted stats I'm sure nobody wants to see them get some form of AT/snare to balance the fact that they're just basically Panzergrens but in nicer uniforms. The T4 place is fine imho, it's the timing of T4 Obers that isn't.