Hello,
A couple of things to bear in mind - games fitted with a C220 (or Sentinel as I still think of them) have additional components on the 'Door Interface Board' in the cabinet, a C220 wouldn't work with the interface as I see in pictures of your machine. If it's still like that, you'd need to change or upgrade it, as I did at the time when converting games from mechanical 'S 10' to C220 doors.
And even then, an o.e. C220 installation wouldn't get around having five different coin values, from 10 pence to £2, as the Wpc board-set has four coin inputs. It was okay for duplicate coin values, such as the new and old 10 pence coins while they were both circulating, but not five different values. If you're set on that, then one method would be an additional coin interface or 'credit' board, placed between the coin acceptor and the machine's own wiring; this (rather than the machine's own settings) controls the price of play, and signals to the machine via one coin input, on a flat 1 coin/pulse, 1 credit basis.