I wonder if they're going to drop/reduce one of the existing MUC routes, to run SOU? (I feel that BRN might be that candidate).
Either that, or something more dramatic like switching the BRS route to be a MUC aircraft, but given that the flight times coincide, it seems unlikely.
As for LCY, can they not just sling a big rubber band out the back and hook it over the Gherkin as they fly past?
Had a wonderful CDG-BRS last night (although check-in had closed 4 minutes early), and the flight was 32/48, which always feels good. (Although the usual caveats about yield remain).