T2, a 222 and a Pak is 720 MP 50 FU.
Two PGren squads is 680 MP.
The drawbacks of skipping T2 are so minor now that it's just not worth 200 MP 20 FU any more.
You forget the 100 muni cost for upgrading Schrecks, which butchers their AI, delays tellers/lmg's and - in the end - gives a worse AT unit than the pak40 (low far accuracy, high bleed, can be kited).
There's a reason pgrens are not that popular as AT. A 222 + pak40 + more tellers is much safer.
I do agree some of the cost of the Kampenya can be moved to T2 tech tho.
Alternative ideas:
- Move some of the mp cost of the Kampenya to T2 vehicles.
- Nerf Ostwind cost/performance slightly.
- IF touching Schrecks: require either Kampenya or Support Korps, so Schrecks are delayed by 85 fuel (105 - 20) if skipping T2.