Pushing it back would surely impact Aintree or Punchestown though, so not convinced that option would necessarily be supported.
If Irish horses aren’t allowed to travel, I reckon they’d look to go ahead. The meeting would still be on the bowl, which is what matters to most of the sponsors, and the betting industry (who provide much of the sponsorship), would likely support it going ahead - voiding ante-post bets on Irish horses, probably being preferable to handing all of it back in the event of a cancellation..