Mae Llywodraeth Cymru a Cadw wedi cefnogi'r cynnig ac mae Cadw wedi paratoi fersiwn arbennig o'r arweinlyfr i Gastell Conwy mewn Japaneeg er mwyn nodi'r datblygiad hwn.
The Welsh Government and Cadw have supported the proposal and Cadw have produced a special Japanese version of the Conwy Castle guidebook to mark the development.