On re-reading Bruce's post I see that you are right -- he was suggesting that ld-linux.so should be doing library-path-modification (prepending /32). I was confusing it with other posts on this topic (eg, Debian mailing lists) where people were suggesting just running it in a chroot.
Bruce's approach (constant string prepended) is probably an easier hack than my approach (make ..../lib/... into .../lib32/...), and provides a more direct way to update the libraries (chroot /32; apt-get update && apt-get upgrade).
So it seems quite feasible.
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