Yeah, this is just... TOO much... and certainly too much for one story.
This is showing Doom as being evil for the sake of being evil. ANYONE can be evil for the sake of being evil, Doom can be honourable, and appalingly polite for the sake of being evil, that's his "thing", a damnsight more than this is.
There's no commentary on the fact that Doom already KNOWS magic, and is bloody good at it. If he'd wanted to challenge Reed like this, all he needed was the spell the four year old could handle, but he knows already Reed can't.
He'd also come up with something a lot more elegant as a trap than this. Strand him somewhere without tech or raw materials, and the spell is used to seal the container with the return switch. All the torment and humiliation, none of this OTT Grand Guignol stuff.