I would say the drawer fashioned a mechanism of his own design and it simply did not work. As you note, your bank cannot read something that is not there anymore. Any argument that would hold your bank liable would be premised on what you should have done and I don't see that you coulda/shoulda done anything differently.
In the same circumstance, I would have written the check to the payee, had him endorse it in blank, and then hand it back to me.
Initialing an alteration is a good practice, but it would not have changed anything here.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.