Unfortuantely not! There’s no room in the plot.
Mel’s got the best chance of being picked up one day, if someone returns to the Braddock Academy and decides they’d like to use her. (Ditto Kid Copper. If I ever do a Braddock Academy bit again, I’ll probably have them feature, unless I make up yet another callback to old UK comics.)
Graham’s trickier – he’s tied to a very specific time and place, and I don’t know how much mileage there is for the average reader in a character who riffs on old ZX Spectrum games. He’s got some great visuals attached to him, though, so maybe one day.
(FASCINATING FACTS DEPT: Partly as a result of the ZX Spectrum, partly from other associations, ”Spectrum” is a word I associate strongly with science, science fiction and the future.)
There aren’t enough Graeme/Grahams in comics, dammit.