Can I find out if a given ext4 block is in the inode table, and if so, can I pick it out of a journal with no header by hand?

So en route from my old laptop to a new one my old laptop's hard drive got some physical damage. badblocks reports 64 bad sectors. I had a two-month-old Ubuntu GNOME setup with a split / and /home partitions. From what I can tell, a few sectors in / were damaged, but that's not an issue. On the other hand, /home's partition gives me this annotated ddrescue log:

# Rescue Logfile. Created by GNU ddrescue version 1.17
# Command line: ddrescue -d -r -1 /dev/sdb2 home.img home.log
# current_pos  current_status
0x6788008400     -
#      pos        size  status
0x00000000  0x6788000000  +
0x6788000000  0x0000A000  -
    first 10 sectors of the ext4 journal
0x678800A000  0x2378016000  +
0x8B00020000  0x00001000  -
    inode table entries for /pietro (my $HOME) and a few folders within
0x8B00021000  0x00006000  +
0x8B00027000  0x00001000  -
    unknown (inode table?)
0x8B00028000  0x00004000  +
0x8B0002C000  0x00001000  -
    unknown (inode table?)
0x8B0002D000  0x001DC000  +
0x8B00209000  0x00001000  -
    unknown (inode table?)
0x8B0020A000  0x00090000  +
0x8B0029A000  0x00001000  -
    unknown (inode table?)
0x8B0029B000  0x4420E65000  +

I made the annotations with use of debugfs's icheck and testb commands; all the damaged blocks are marked used. Some superblock stats:

Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      972
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512

So my questions are:

1. Can I find out exactly what those five unknown blocks were, if not inode entries? My suspicion is that they are inode table entries, but icheck doesn't want to say. If they are, can I find out which inodes?


2. Can I still recover these inode table entries from the journal by hand, even though the first 10 blocks of the journal are lost?

I'd rather not do this data recovery with fsck, which will just dump all my files i n /lost+found in a giant mess of flattened directory structure and duplicate files...

Thanks.