Assuming the upgrade does need to come sooner (and that's still just an assumption at this point imo), one way to avoid the coinciding with the T-70 powerspike at T3 (which is one of the reasons it was placed in T4) would be to introduce a battlephase-esque side-tech in T3 (like the secondary unlock for USF techs) that unlocks the 7 men Cons upgrade.
The cost of this side-tech would be deducted from the cost of T4 and the upgrade would be a requirement to put up T4. This way the Cons upgrade could come a bit sooner while keeping the exact same timings/costs for tech.
One downside of this is that it effectively does nothing for non-Con builds, but then again that is also how most of the Battlephases for Ostheer work (some give an upgrade for some units, some give access to other units, some just do nothing).
So for example:
T3 240MP / 85FU
New: "T3.5 side-tech" 50MP / 20FU
- Unlocks 7 men Cons upgrade
T4 240MP / 90FU -> 190MP / 70FU (-50/20)
- requires T3.5 researched
Again though, that's assuming the upgrade needs to come sooner. We're going to need a few weeks of testing to get a good (objective) feel for it before meddling with this imo.