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I’m not sure how it is for others, but about 80% seems to be working for me, with a few exceptions:
1. It still relies on AddonPeds, even though PedSelector is the current standard. Because of that, custom peds don’t show up.
2. Some add‑on cars don’t appear, unlike when using the old Add‑On Spawner.
3. Ideally, if no.1 would be fixed, there should also be a character swap option where you can use a different model (e.g. Batman) but keep the original character’s hash (e.g. Franklin). That way missions, money, and progression still function under Franklin while you play as Batman.

if @RampageDev is able to fix these, that would be amazing!

@mitto_backup I have a workaround on that if you want to achieve using Franklin but looking different.

1. Ped Selector → swaps Franklin’s visual model to Batman (or any ped you want).
2. Character Swap → restores Franklin’s hash but still looks like Batman, so missions and scripts still treat you as Franklin.
3. Rampage Trainer → edits clothing on the swapped ped.

@schio84dude adding to what mitto_backup said, there was a trainer back then that kinda does that (the logo was like Three Scales from Silent Hill f). You can switch to a ped you like, then you can update the model hash of franklin and be looking like Tony Stark ped while accessing all Franklin's money and house. The downside of that is all your weapons gets wiped out at first.

Works as intended. Although sometimes one or two of the peds I spawn won’t shoot at the enemies even if they have weapons. Anyway, thank you, @sollaholla and @TheMadBreaker.