Worcester was a bit of a poor example to choose, having two separate city stations with services split between them, now joined by a third suburban station, all three having separate hourly services from Birmingham, let alone its own established direct London service to Paddington. It seems unrealistic to pin hopes on yet another service from Moor Street via Bromsgrove, for which tracks don't even exist beyond some crayonista imagination.
More straightforward to consider Wolverhampton, Walsall, Shrewsbury ... all significant regional places, only served (and servable) from New Street.