It is unfortunate that this has occurred but it is difficult to see an easy way round it. A definitive answer cannot be given to competitors until after the closing date. If the organisers had rejected some of the entries outright ages ago I'm sure there would still have been people not happy, especially if it turned out there were not enough entries to fill the grid.
As for the sidecar crew. Previous form is difficult to establish. Am I right in thinking he only did half of the lap for newcomers, on the first evening of practice, behind a travelling marshall before the accident. He certainly doesn't fit into categories 1/2 from the regs (thanks for that Cargo), so it all boils down to how many other entries were received from newcomers and a few "at the discretion of the Organisers."