Old wall warts are pretty dirty .. but I have managed to power a CC-compatible pack directly from a 12-volt wall wart before (or even a nine-volt battery). Since CC PL has a dry audio bus, it's less critical how clean the supply is than on an RTS system.
Those power adapters, are those AC or DC outputs? It would be rather a simple matter to cobble together a filter capacitor bank and a regulator
circuit to clean those up. The 317 takes about 3
volts off the top, so if that's DC I'd take the 30 volt supply because there's more to cut off. If AC, I'd take the 24 volt supply since that'll make about 32 volts DC, which will clean up nicely, and be able to supply more current.
If I had the choice, though, I'd get a good beefy iron transformer. The one I used came free with the chassis! (my schematic and photos at
crossroadsofarlington.org/wayne/rts-psu )