Going forward post Covid19 as a fuel saving / efficiency measure, could the Citaros normally allocated to the evening 6 & X30 boards not be swapped at the MetroCentre with Green Arrow E200MMC's or StreetLites?

I know that back towards the end of the 00's, GNE swapped Lolynes on the Coasters with VDL Cadets during the evenings at the Redburn and they also used to swap Dennis Lance Wright 320's on the old 85 / 86 with MPD's.