Can I make it fit, or do I have to just let it go?
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Maybe if you use a file system that supports compression, e.g. btrfs, bcachefs, F2FS, squashfs, or EROFS. Of course, you'd need to add a separate FAT32 EFI System Partition for the bootloader, not sure how to do that.
https://github.com/ventoy/Ventoy/issues/817