I get where you're going with this, and in fact I am all for having a greater variety of equipment choices, but given these points why would you pick one of these when you can have levitation?
Levitation does not provide straight up combat effectiveness like stat boosts do, even if negligible. I'm personally more worried that stat belts will generate unnecessary micromanagement via belt swapping for fights vs safe exploration.
Regarding the rest of the changes:
Willpower helmet fits in with INT, WIS & PER well enough if and when willpower is made more useful. Until then, misleading players with a useless effect feels rather awkward. The ESP helmet could be neat! Currently the arguably optimal route is to go ESP amulet with a helmet brilliance for that juicy synergy, so providing a viable choice for the helmet is welcome. Teleportitis helmets are not going to be optimal by any means (random teleportation rarely occurs when needed), but could still be used instead of vanilla headgear with telecontrol. The helmet of Maclua is still another choice for the player even if I'd personally still prefer the INT helmet + ESP amulet.
The amulet additions are fine as is I feel. There isn't currently much competition for an AoLS for combat against visible foes and ESP for general use. One thing I do have to point out: I highly doubt any player will be able to find an amulet that's only wishable. Perishable amulets are an interesting idea, but they do need to be able to be found without spending wishes.
Rings of light would be great! Even if they're not really worth an equipment slot when light crystals exist, additional interesting permanent light sources would be lovely.
Artifact shields should provide some incentive to use shields in general, which can only be a good thing.
The mantle and lycanthrophy cloak are both likely way too risky to use and may end up being just a flavour item, which by itself isn't a bad thing.
Cloak of flight again is not really something a new player will be able to find out without outside sources, there should at least be a tiny chance of it spawning naturally.
The armor cloak should be a fine addition so long as the numbers are tuned well enough, exchanging the currently optimal elemental resistances for more armor should come with some drawback.
Y'yter Durr could be neat! I would likely end up just staying in human form since stat and skill gains do not transfer between polymorphs.
I'm not so sure about the artifact changes. Keeping the player from multiples of artifact weapons is might be fine (rip 2x Turox, you were the best), but denying material changes will simply mean some of them will be even less viable. Take Saal'Thul for example: invisibility is easy enough to come by from wands or rings for ordinary adamantine or valpurium short swords to be preferrable in every case. I don't think the change works flavour-wise either, if mortal magic scrolls of enchantment or repair can still be used.