My suggestion would be:

Debrand 4660-62 and just keep them in the 2 tone green base and just put arriva logos on the front sides and rear.

Then

Either
Repaint and rebrand 1408/11/80to cross pennine seeing as the X16 is only the Kirkhill circle and operated by Blyth now so realistically 1408/11 are branded for a route that For the most part doesn't exist any more so 1408/11 don't need branded. And the 306 pulsars rarely actually go on the 306 and 1480 is numerically the first 306 pulsar after 1411

Or

Repaint and brand 7557/8/60 to Cross pennine and add USBs to the seat backs seeing as they'll be up to cross pennine spec with the addition of USBs.

Or Repaint & rebrand 1480/95/96 to cross pennine seeing as they're rarely on the 306

Or

Go down the sapphire route and Repaint and rebrand 1479/1512/1513 to cross pennine spec and add NSAs to the 685 so that the 685 is sapphire spec with cross pennine branding