That would be simply stupid and even worst for balance because they will simply copy assault grens and OKW will come back to being not that good against infantry (especially if Mp40s will be doctrinal) while burdening sturmpios with something that doesn't fit them.
Solutions for OKW re-balance:
1. Come back to shrecks on volks. You all will want that if these changes are here to stay;
2. Remove shrecks from SPs and keep all other changes.
3. Remove shrecks from SPs and fausts from volks and create a panzerjager unit, 4 members, in medic truck that will come by default with 1 shreck and cost 400 MP or so.
The idea is that OKW needs something to suplement its tanks / AT capabilities but fausts + shrecks + buffed raketen is to much!
Edit: for solution number 3, at vet 2 panzerjagers obtain the "specialized aim" ability. Cost: 35 amo. Duration: 30 seconds. Effects: improve accuracy by 40%.
Each and every of these solutions is by leaps and bounds more reasonable than the Sturmpocalypse.
If they do go ahead with the Sturmpioneers, they SERIOUSLY need to consider reworking their veterancy and adjusting the MP cost. Otherwise it's going to be insane; even for a balance mod.
Sturmpioneers are NOT squishy at all
They feel squishy because they don't get Vet; currently.
They start off with 87% received accuracy at Vet0, and move on to 51% received accuracy at Vet4. Vet3 "terminator" Riflemen have 59% received accuracy at Vet3.
This means that Sturmpioneer get 15% received accuracy bonus ON TOP of Vet3 Riflemen.
You are going to LOVE those snipes
When a SP reaches Vet5, they get a cumulative 68% accuracy bonus. Assuming a target size of 20 (most medium tanks), SP will have 100% far accuracy vs enemy tanks that happen to cross their tanks. Fun!
On top of that, you will have 3 models free dishing out that Schreck-vetted AI power and spamming stun grenades.
Sturmpioneers are just another T0 unit; what changes really?
The reason that nobody ever builds more than 2 Sturmpioneers is because they have very little combat utility the moment the first light hits the field. If you've spammed 4 Sturmpioneers, you are probably going to get destroyed by the first m20. With Screck Sturms, why would you ever open your games with anything but SPs?
The main reason why schreck blobs feel so powerful is because their host is a T0 unit. This means that you can freely spam that T0 unit (Volks) without having to worry of any consequences that follows; the game has got your back, when you need it (panzerschreck upgrade).
For those of you that don't know, Panzergrenadier blobs are also effective. However it is very difficult to achieve that critical mass. This is because by the time Panzergrenadiers become available, you already had to spend a crap-ton of manpower on anti-infantry stuff. You CAN'T afford to start spamming 340 PGrens on top of what you've spent; you need to tech up and start tapping on your fuel reserves.
What we are going to see with SPs is a meta reversal. Nobody sane is going to bother with Volks until they get T1/T2 up (Volks don't have access to nades/fausts before that) -- maybe one single squad for capping.
If OKW MUST have schrecks, they should not get it on a T0 unit. It can be Obersoldaten, or it can be a completely different unit on another tier.