Soil vent pipe branching off from rodding eye?

[WWilts]

Soil vent pipe open to atmosphere - can it be come off the rodding eye at top (east)? Instead of the position shown on the pic.

Underslab drainage: bed and bench in pea gravel, with compressible material on top, then concrete (where there is space beneath the ground floor slab).

PS  South (right) is the front elevation. East (top) elevation is relatively private and screened. There is a blank wall (no windows/doors) on the north (left) half of the east (top) wall.
Pumping station likely to be near SW corner (bottom right). About 1200 ltr capacity tank with one (or perhaps twin) pump.

Other comments/suggestions on the foul drainage are also welcome.