I searched for all instances of "Moogle Charm" or "Black Belt" in Keylie's spreadsheet, noted their setup, noted their expected useable or equipable flags, and tested all of them.
Mould 0
I did all of my testing against 2x Sand Ray because it was the most stable earlier and it is easily accessible.
7E20FF=312 -
NG - Expected result is a Moogle Charm which is equippable for party member 3. All I wrote down was 'X'.
430 -
NG - Expected results is a MC which can be equipped by members 1 and 4. I did get that result, but I couldn't escape the battle.
48A -
OK - Gives you a MC which can be immediately equipped on party members 1 or 2. However, the resulting animation takes 70,000 frames to finish.
212C -
OK - Gives you a MC which can be equipped on anyone except #3. Ally #1 also somehow ends up with Goggles equipped which is a nice bonus! Too bad this animation takes 130,000 frames to return.
2980 -
OK - Gives you a plain MC which can't be immediately equipped. Works fine and only takes 10k frames to resume.
41CD -
OK - It is supposed to give you a MC which is equipable to anyone except #4. I wasn't able to equip the MC and this also took 10k frames to return.
6AC2 -
NG - This is supposed to directly equip a MC onto party member 4. I never lived to see it though. I could delay the hang by queuing a Warp Stone, but I never escaped the battle.
1B8 -
NG - I expected a useable Black Belt. Instead I got no Black Belt at all and a hang.
4D4 -
NG - This does give me a useable BB, but then the game hangs.
4136 -
OK - This puts a Black Belt directly onto member #4, and technically one with the right "useable" flag. But it can't be used.
417F -
OK - Same as above. Only good if you want a BB.
41E2 -
NG - I got the Black Belt, but the game hung. (It wasn't a useable BB anyway.)
41EF -
OK - Gives you the expected unusable BB, but there is a long wait.
Mould 1
I did all of my testing against formation 12 (1x Sand Ray 2x Areneid) because it seemed natural after doing my other testing against formation 10.
7E20FF = 3FA -
OK - Puts a bunch of Moogle Charms into slot 255 as promised! There is a lot of lag, but no wait! These Moogle Charms can be equipped on anyone with the optimum glitch. One small problem, you'll have to save and reload. On all interior maps the world will be shaking, the camera won't follow you, and you'll be prone to rare teleports inside of walls. (But a save and reload fixes all that.)
3FC -
OK - Promised me a MC that I could equip on #1 or #3, but gave me an unequipable MC instead. No delay though.
434 -
OK - Correctly gave me a plain MC that couldn't be equipped in battle.
2959 -
NG - Returned quickly, but didn't give me a MC at all.
4126 -
OK - Correctly changed slot 209 to be a Moogle Charm with 0 quantity. (This is not useless.) I think it also correctly inherited the equip flags of the slot before its contents were replaced.
6144 -
NG - Did not give me a Moogle Charm.
6A36 -
OK - The Moogle Charm was supposed to be equipable to #4, but no one could equip it.
6AEE -
NG - Did not give me a Moogle Charm.
1B6 -
OK - Gave me an unequipable MC and an unusable BB like it was supposed to.
3B8 -
OK - Very laggy, but it does provide both (yes both) useable Black Belts that it claims to.
4F4 -
NG - The only item I got was Dirks. (2 Soul Sabers at the end.) Very unusual. No Black Belts.
41E2 -
OK - If you want your Black Belt in slot 255 for some reason, this works fine. This outcome also breaks the interior cameras.
61CA -
OK - Like 3B8 this also correctly provides a pair of useable Black Belts.
6A58 -
NG - Was supposed to provide a useless Black Belt. Instead crashed the game. Kind of unusual for mould 1.
6A7A -
OK - Very laggy, but it does provide a useable Black Belt.
tl;dr - mould 1 can provide a stable Moogle Charm if you're willing to save and reload. There are numerous safe ways to obtain a useable Black Belt and everything on the Triangle Island is mould 1. So now we don't even need the glitch that rekindled the interest in this TAS.