Out of curiosity, are you planning on using the gauntlets as weapons or using them for mastery on unarmed strikes? Because there is a logic for the strict demarcation between the melee attacks with weapons v. unarmed strikes in the 5e24 rules. Having gauntlets as weapons is trivial (it's just reskinning), but allowing mastery for unarmed strikes is ... different?
I know you've looked at this, but the rules for grappling/shoving in 5e24 require an unarmed strike ("a melee attack that involves you using your body to damage, grapple, or shove a target within 5 feet of you."). 5e24 (unfortunately, IMO) uses a lot more of the keyword system, and a lot of different abilities, feats, and what not are keyed off the language of "Unarmed Strike."
This ends up causes synergies in some areas- Way of the Elements monks get extended grappling range, because they have extended range to unarmed strikes, and grapples are part of unarmed strikes. Crusher works with unarmed strikes, since the language applies to an attack that deals bludgeoning damage (unless you're a monk dealing force damage). But other things are not allowed to work with an unarmed strike- you cannot use true strike (requires a weapon) or weapon masteries (requires a weapon) with an unarmed strike.
I had to go over all of this when I was trying to make a dance ... um, character. One idea is to have a single gauntlet as a weapon (reskin a club or other bludgeoning weapon, or put metal knobs and reskin a mace, or whatever is appropriate) and use it to make weapon attacks with mastery. Have the other hand free to make unarmed strikes.