I am very sorry for your loss.
I also -highly- recommend that once you get a custom firmware 3ds or access to Homebrew (from the link Kaphotics provided) that you use JKSM to back up your save data: https://gbatemp.net/threads/release-jks-savemanager-homebrew-cia-save-manager.413143/
And you can use this for DS games: https://gbatemp.net/threads/release-twlsavetool-v1-0.412887/
I explicitly use it for emergency backup saves, but I make sure a friend of mine always has a somewhat recent version of all my game cartridges in case of things being stolen, technical failures, natural disasters, etc. Storing it in the cloud (and updating it somewhat regularly) is also a viable option.
In your case, you can use it to rip your save, and inject the wonder cards from the event gallery into the games with PkHex. Just make sure it is redeemable on the game version and 3ds version you are using so the pokemon are legal. For example, some events are exclusive to ORAS, where some are exclusive to XY. (This applies to all generations)This way you can reclaim the events you lost. Example:
I also did want to add that Pokebank is actually linked to your NNID. When I bricked my 3ds doing a shell swap, I had my NNID moved to my new console. Bank retained all the pokemon I had previously stored inside it. (Which is good, because I had like 2,000+ pokemon in there) I lost a lot of my digital games save because of that, which is why I'm very adamant about ensuring you have access to backups.
Good luck!