Maybe there is a way to install it on an amiga:
- install the ext2 filesystem (I've seen one on the aminet, but never tested)
- partition/format
- copy the tarball on the ext2 partition
- boot into linux using one of the old initrd.gz's (e.g.
http://people.debian.org/~smarenka/d-i/m68k/images/20090814-01:14/nativehd/)
- extract the tarball
This is untested. Extracting the tarball on amiga will work mostly buy not for the /dev entries. If the initrd also contains the AFFS filesystem and mkfs.ext2 then you can read the tarball from an amiga partition and format ext2 under linux.
And as for the filesystem I recommend ext2 in favor of ext3/4 on Flash media (like CF-Card, SD-Card, Usb-Stick) because there is much less writing due to not having journaling. (On HDD and modern SSD ext4 is probably best.)