Not really, your only option to completely restore them is to roll back to your latest backup before the deletion, but then you lose any recent changes.
An alternative is to install this backup on another system and copy and paste from there. You won't get all the history on the issues, but maybe this is preferable.
Yeah, the trashbin approach is painful since issues' fields may not all be visible then. I've played around with using an issue security scheme to make the issue invisible to most people.
Anyway, the way to get the lost data back is to restore a backup into a separate throwaway instance of JIRA
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