How about…. 4 Counties clockwise as far as Autherley, on a bit to Aldersley, up the Wolverhampton 21, BCLM, Netherton Tunnel (either nip down Factory, or the long way round Old Main Line/Brades), Delph, down to Stourton, back up to Autherley and continue the 4 Counties. Potential side quests to Hawne Basin, Stourbridge and even Titford if time allows?
That said, T&M down to Fradley, into Birmingham via Aston/Farmers Bridge and out again via BCLM/Wolverhampton and back on the ring at Autherley is a possibility. I’d rather do Aston/Farmers Bridge/middle of Birmingham than go through Manchester again.