| Bobson |
You can't permanently enchant a monk's unarmed strike, since that's not a spell. That line just means you can cast either magic weapon and magic fang on a monk. If it's not a spell, it doesn't work. So the monk could have someone cast magic weapon on his hands each morning, but he couldn't get them permanently +3. That's what the Amulet of Mighty Fists is for.
Providing a creature with an enchanted weapon (like a gauntlet) only helps if that creature then makes attacks with that weapon. Unarmed attacks are not natural weapons and vice versa.