Thanks again, Peter. I like that conclusion. I was hung up on the language at the outset of 408(h) which provides that it applies "for purposes of this section." However, there is also the last sentence that says the custodian will be treated as the trustee (which implies, at least to me, that the custodial account will be treated as a trust) "for purposes of this title," which would include 1563.
I'm inclined to go with this analysis unless anyone else has other thoughts on this that they would be kind enough to share.
Thank you again, Peter, for all of your help!