I'm amazed Weekend is still going really - always assumed it was just a sweetener for sacking Aled. I don't think it would weaken the GMB brand by having a branded spin-off air at the weekend as long as it is distinguishable from the main show, so branded GMB Today or GMB Weekend with slightly different presentation (as it has now). They could also ship Kate Garraway off there.
Stay Home. Protect the NHS. Save Lives.