Has the planning for the Camp Hill services been decided upon yet? I've read enough plan iterations that I don't know what the current state is, but perhaps there is interworking opportunity with Shrewsbury services, either the service via Galton Bridge or via Tame Bridge Parkway.
If I remember correctly (though this is a hazy memory), there used to be interworking between Hereford, Shrewsbury and Rugeley (back before it was electrified and 170+153 combos were common) but it was presumably eliminated to stop delays being exported across (then) London Midland's network.