If I had the bits on hand, gluing some lolly sticks behind the hole at least stops it all falling out the back. A bit fiddly tbh. If you can get the filler to hold and don’t mind doing a couple fills that might be the most straightforward.
Matches, string and super glue should get you there a bit easier. I leave the details to each person's imagination.
@Grumpy_Git started
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If I had the bits on hand, gluing some lolly sticks behind the hole at least stops it all falling out the back. A bit fiddly tbh. If you can get the filler to hold and don’t mind doing a couple fills that might be the most straightforward.