11.04 Bootable USB flash drive with ext4; want to make identical copy FAT32

[gojomo]

I made a handy bootable Natty-11.04 USB stick, and it's generally been working well, and been customized to my liking.

Now, though, I wish I'd made it use FAT32, rather than EXT4, so that I can more easily access the files elsewhere.

I know I could simply 'dd' the full image to another USB stick to have an identical booting copy still with ext4.

What's the shortest number of steps to having a copy with identical file contents, and still bootable, but FAT32 instead?

I suppose it's something like:

(1) Preformat new USB stick FAT32 (know how to do)
(2) Copy everything over (know how to do)
(3) Install right MBR and grub in special location (fuzzy on how to do this step after the above)

Any tips/pointers?

Thanks,

- Gordon