When/if an emperor reigns for over 100 years, would they shorten the format as-per-iso shorthand rules? That is, would the year Reiwa 106 also be written as 6/1

When/if an emperor reigns for over 100 years, would they shorten the format as-per-iso shorthand rules? That is, would the year Reiwa 106 also be written as 6/12/20 ?